The partial molar volume of water in the given ethanol/water solution is 46.82 cm3/mol.
The molar volume of a substance is the volume that one mole of a substance occupies at a specified temperature and pressure. The partial molar volume of a component of a mixture is the change in volume of the mixture when one mole of the component is added, assuming that the volume of the other components stays constant.
A 20% by mass ethanol/water solution has a mass density of 968.7 kg/m3 at 20 °C. At a fixed temperature and pressure, the partial molar volume of a component is directly proportional to its mole fraction in the mixture.
The mole fraction of ethanol in the solution can be calculated as follows:
Let's assume that the solution's total mass is 100 g.20% by mass of ethanol implies that 20 g of ethanol is present in the solution.
Molar mass of ethanol = 46.06844 g/mol
Number of moles of ethanol = (20/46.06844) = 0.434 mol
Molar mass of water = 18.01528 g/mol
Number of moles of water = (100-20)/18.01528 = 3.865 mol
Total number of moles in the solution = 0.434 + 3.865 = 4.299 mol
Mole fraction of ethanol in the solution = 0.434/4.299 = 0.101
The mole fraction of water in the solution is 1-0.101 = 0.899.
A 52.2 cm3/mol ethanol partial molar volume is given. The partial molar volume of water in the solution can be calculated as follows:
Partial molar volume of water = (52.2 cm3/mol) * (0.899 mol/mol of water) = 46.82 cm3/mol
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Give the name of each of the following compounds. a. HClO
3
b. CaBr
2
c. Re(CO
3
)
2
d. CI
4
e. NaH
2
PO
4
f. SnF
2
a. HClO3 is named chloric acid.
b. CaBr2 is named calcium bromide.
c. Re(CO3)2 is named rhenium(II) carbonate.
d. CI4 is named carbon tetraiodide.
e. NaH2PO4 is named sodium dihydrogen phosphate.
f. SnF2 is named tin(II) fluoride.
a. HClO3 is named chloric acid. The compound consists of hydrogen (H), chlorine (Cl), and oxygen (O). The prefix "chlor-" indicates the presence of chlorine, and the suffix "-ic" indicates that the compound is an acid. Therefore, HClO3 is named chloric acid.
b. CaBr2 is named calcium bromide. The compound contains calcium (Ca) and bromine (Br). The name of the cation (Ca2+) is simply stated as calcium, while the anion (Br-) is named bromide. Therefore, CaBr2 is named calcium bromide.
c. Re(CO3)2 is named rhenium(II) carbonate. The compound consists of the transition metal rhenium (Re) and carbonate ions (CO3^2-). Since rhenium can form multiple oxidation states, the Roman numeral (II) is used to indicate the charge on the rhenium ion. The carbonate ion is named using the suffix "-ate" for its highest oxidation state. Therefore, Re(CO3)2 is named rhenium(II) carbonate.
d. CI4 is named carbon tetraiodide. The compound is composed of carbon (C) and iodine (I). The prefix "tetra-" indicates the presence of four iodine atoms, and the suffix "-ide" indicates that it is a binary compound. Therefore, CI4 is named carbon tetraiodide.
e. NaH2PO4 is named sodium dihydrogen phosphate. The compound contains sodium (Na), hydrogen (H), phosphorus (P), and oxygen (O). The prefix "di-" indicates the presence of two hydrogen atoms, and the suffix "-ate" indicates the presence of phosphate ions (PO4^3-). Therefore, NaH2PO4 is named sodium dihydrogen phosphate.
f. SnF2 is named tin(II) fluoride. The compound consists of the element tin (Sn) and fluoride ions (F-). Since tin can form multiple oxidation states, the Roman numeral (II) is used to indicate the charge on the tin ion. The suffix "-ide" indicates that it is a binary compound. Therefore, SnF2 is named tin(II) fluoride.
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What substituent groups make up the following ether? ethyl and phenyl propyl and benzyl ethyl and benzyl propyl and phenyl None of these choices.
The substituent groups make up the following ether are the substituent groups that make up ethyl phenyl ether are A. ethyl and phenyl, and the substituent groups that make up propyl benzyl ether are B. propyl and benzyl.
An ether is a class of organic compounds that contain an oxygen atom that is bonded to two alkyl or aryl groups. Ethyl phenyl ether is an ether that is formed when phenol is treated with ethyl iodide in the presence of a base such as sodium hydroxide. Ethyl phenyl ether has a sweet, fruity odor and is used as a solvent and a flavoring agent in the food industry.
Propyl benzyl ether, on the other hand, is formed by the reaction of benzyl chloride with n-propyl alcohol. It is used as a solvent for resins, lacquers, and oils. The given ethers are ethyl phenyl ether, propyl benzyl ether, ethyl benzyl ether, and propyl phenyl ether. Among these, the substituent groups that make up ethyl phenyl ether are A. ethyl and phenyl, and the substituent groups that make up propyl benzyl ether are B. propyl and benzyl.
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How many protons does each of the isotopes have? Oxygen has three isotopes,
16
O
3
17
O, and
17
O. The Express your answers as integers separated by commas. atomic number of oxygen is 8 . Part B How many neutrons does each of the isotopes have? Express your answers as integers separated by commas.
The number of neutrons in 18O is 10. Each of the three isotopes of oxygen has eight protons and their respective numbers of neutrons are as follows: 16O has 8 neutrons, 17O has 9 neutrons, and 18O has 10 neutrons.
The atomic number of oxygen is 8. Therefore, the atomic number of an atom is equal to the number of protons it has. As a result, each of the oxygen isotopes has eight protons. Now let us calculate the number of neutrons in each of the isotopes:16O: The atomic mass of 16O is 16, and the atomic number is 8.
To find the number of neutrons, we need to subtract the atomic number from the atomic mass.16 - 8 = 8Therefore, the number of neutrons in 16O is 8.17O: The atomic mass of 17O is 17, and the atomic number is 8. To find the number of neutrons, we need to subtract the atomic number from the atomic mass.
17 - 8 = 9Therefore, the number of neutrons in 17O is 9.18O: The atomic mass of 18O is 18, and the atomic number is 8. To find the number of neutrons, we need to subtract the atomic number from the atomic mass.18 - 8 = 10Therefore, the number of neutrons in 18O is 10.
In conclusion, each of the three isotopes of oxygen has eight protons and their respective numbers of neutrons are as follows: 16O has 8 neutrons, 17O has 9 neutrons, and 18O has 10 neutrons.
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Calculate the freezing point and boiling point of a 2.0 m ethylene glycol solution. [Use Kf and Kb data from Table 12.7 in the textbook.]
the freezing point and boiling point of a 2.0 m ethylene glycol solution, we can use the colligative properties of the solution. Colligative properties depend on the concentration of solute particles in the solution.
The freezing point depression (ΔTf) and boiling point elevation (ΔTb) can be calculated using the following formulas:ΔTf = Kf * mΔTb = Kb * mWher- ΔTf is the freezing point depression- ΔTb is the boiling point elevation- Kf is the molal freezing point depression constant
Since we have a 2.0 m (molal) ethylene glycol solution, we can use the values for Kf and Kb from Table 12.7 in the textbook to calculate the freezing point depression and boiling point elevation. I would need you to provide the values for Kf and Kb from Table 12.7 in your textbook.
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The Shosholoza steam plant in Soweto generates steam at a pressure of 9.5MPa, which is then passed through a turbine. The compressor is set to operate at 10kPa. 1 kg of dry saturated steam is assumed to enter the turbine. Determine:
1.1. The Rankine efficiency in \%.
1.2. The work output neglecting the feed-pump work.
1.3. The specific steam consumption (SSC).
1.4. The work ratio.
1.5. The heat supplied. [26 Marks]
Rankine efficiency, η = 0.542%
The net work output = 12.9 kJ/kg
The heat supplied is 2947 kJ/kg.
The Shosholoza steam plant in Soweto generates steam at a pressure of 9.5 MPa, which is then passed through a turbine. The compressor is set to operate at 10 kPa. 1 kg of dry saturated steam is assumed to enter the turbine. The Rankine cycle is the basic thermodynamic cycle used for power generation.
It includes a turbine, a condenser, a feed pump, and a boiler. The Rankine cycle is a theoretical cycle in which the working fluid is water, and the cycle proceeds through the four components mentioned above. The following is the solution to the problem:
1.1. The Rankine efficiency in \%
The Rankine efficiency is defined as the ratio of the network output to the heat input.
Qin = h1 - h4 = 3157.9 - 210.9 = 2947 kJ/kg
Qout = h2 - h3 = 3145 - 213.7 = 2931 kJ/kg
Net work output Wnet = Qout - Qin
= 2931 - 2947
= -16 kJ/kg
The negative sign indicates that work is being put into the system.
Rankine efficiency
η = Wnet/Qin = -16/2947 x 100% = 0.542%
1.2. The work output neglecting the feed-pump work.
The net work output Wnet = h1 - h2 = 3157.9 - 3145 = 12.9 kJ/kg
1.3. The specific steam consumption (SSC)
The specific steam consumption is the mass of steam required per unit power output.
SSC = 3600/Qin = 3600/2947 = 1.222 kg/kWh1.4.
The work ratio
The work ratio is the ratio of the net work output to the work done by the pump.
WR = Wnet/Wpump
Wpump = h4 - h3 = 210.9 - 213.7 = -2.8 kJ/kg
WR = 16/-2.8 = -5.71.5.
The heat supplied
Qin = h1 - h4 = 3157.9 - 210.9 = 2947 kJ/kg
Therefore, the heat supplied is 2947 kJ/kg.
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Suppose you wanted to produce an aqueous solution of pH = 8.80 by dissolving one of the following salts in water: NH4Cl, KHSO4, KNO2, NaNO3.
KNO2 is used what is the molarity?
I put 2.2 and got it wrong
The molarity of the KNO2 solution needed to produce an aqueous solution with a pH of 8.80 is not 2.2.
To determine the molarity of the KNO2 solution, we need to consider the acid-base properties of the salt. KNO2 is the salt of a weak base, nitrous acid (HNO2), and a strong base, potassium hydroxide (KOH). In water, KNO2 will undergo hydrolysis, resulting in the formation of nitrite ions (NO2-) and hydroxide ions (OH-).
Since we want the solution to have a pH of 8.80, we need to consider the concentration of hydroxide ions. The pH scale is logarithmic, with a pH of 7 being neutral. A pH greater than 7 indicates a basic solution. The concentration of hydroxide ions in a basic solution is higher than in a neutral solution.
To calculate the molarity of the KNO2 solution, we need to find the concentration of hydroxide ions that corresponds to a pH of 8.80. By using the formula pH = -log[H+], we can determine the concentration of hydroxide ions ([OH-]).
pOH = 14 - pH
pOH = 14 - 8.80
pOH = 5.20
[OH-] = 10^(-pOH)
[OH-] = 10^(-5.20)
[OH-] ≈ 6.31 x 10^(-6) M
Since KNO2 hydrolyzes to produce one hydroxide ion for every one mole of KNO2, the molarity of the KNO2 solution is approximately 6.31 x 10^(-6) M.
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What volume (mL) of concentrated NH3 (14.8 M) should be used to prepare 400.0 mL of a 0.300 M NH3 solution?
Group of answer choices
7.11
7.55
8.11
8.55
The volume (mL) of concentrated NH3 (14.8 M) should be used to prepare 400.0 mL of a 0.300 M NH3 solution is 8.11 mL
To calculate the volume of concentrated NH3 needed to prepare the desired solution, we can use the dilution formula:
C1V1 = C2V2
Where:
C1 = initial concentration of NH3 solution (14.8 M)
V1 = initial volume of NH3 solution (unknown)
C2 = final concentration of NH3 solution (0.300 M)
V2 = final volume of NH3 solution (400.0 mL = 0.400 L)
Plugging in the values into the formula:
(14.8 M)(V1) = (0.300 M)(0.400 L)
V1 = (0.300 M)(0.400 L) / (14.8 M)
V1 ≈ 0.008108 L
To convert the volume to milliliters (mL):
V1 = 0.008108 L × 1000 mL/L
V1 ≈ 8.11 mL
Therefore, approximately 8.11 mL of concentrated NH3 should be used to prepare 400.0 mL of a 0.300 M NH3 solution.
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103 Identify the groups of the periodic table in which all the elements form ions of the charge indicated. (a) 1+ cations (b) 2+ cations (c) 1− anions (d) 2− anions
(a) 1+ cations: Group 1 elements (alkali metals) in the periodic table form 1+ cations.
(b) 2+ cations: Group 2 elements (alkaline earth metals) in the periodic table form 2+ cations.
(c) 1− anions: Group 17 elements (halogens) in the periodic table form 1− anions.
(d) 2− anions: Group 16 elements (chalcogens) in the periodic table can form 2− anions.
In the periodic table, elements are grouped based on similar chemical properties. The number of valence electrons in an atom determines the charge it can acquire when forming ions.
Elements in Group 1 (such as lithium, sodium, and potassium) have one valence electron, which they readily lose to form 1+ cations. Elements in Group 2 (such as beryllium, magnesium, and calcium) have two valence electrons, and they tend to lose both to form 2+ cations.
On the other hand, elements in Group 17 (such as fluorine, chlorine, and bromine) have seven valence electrons. To achieve a stable electron configuration, they tend to gain one electron to form 1− anions.
Finally, elements in Group 16 (such as oxygen, sulfur, and selenium) have six valence electrons and can gain two electrons to form 2− anions.
Understanding the periodic table and the properties of elements in different groups helps us predict the charges of ions they form. Group 1 and Group 2 elements tend to lose electrons, while Group 17 and Group 16 elements tend to gain electrons.
This pattern of electron gain or loss enables us to identify the groups of elements that form specific ions. By categorizing the elements based on their behavior, scientists have developed a systematic way to organize and understand the properties of elements.
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what is the element with the abbreviated electron configuration [kr]5s24d8?
The element with the abbreviated electron configuration [kr]5s²4d⁸ is Palladium (Pd).
Electronic configuration refers to the distribution of electrons in the various energy levels, sublevels, and orbitals of an atom. The electron configuration of an element can be used to describe the periodic table's organization and chemical properties. Palladium (Pd) is the element with the abbreviated electron configuration [kr]5s²4d⁸ .
Palladium (Pd) is a transition metal with a melting point of 1554.9°C and a boiling point of 2963°C. Palladium has a density of 12.023 g/cm³ and is a silvery-white metal that is corrosion-resistant and has a high catalytic activity. Palladium is a chemical element that is classified as a noble metal. It is one of six platinum-group metals (PGMs) that are extremely rare and valuable.
Palladium is used in a variety of industrial applications, including catalytic converters, electronics, dentistry, and jewelry. Palladium is a versatile metal that has a range of applications, making it a highly sought-after and valuable element.
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Which molecule has a trigonal planar shape
The molecule that has a trigonal planar shape is Boron trifluoride (BF3).
Trigonal planar is a molecular geometry model with one atom at the center and three atoms at the corners of an equilateral triangle. Trigonal planar geometry is found in molecules where the central atom has three bonds and no lone pairs. Boron trifluoride ([tex]BF_3[/tex]) is an example of a molecule with a trigonal planar geometry as it has a central Boron atom that has three covalent bonds with three fluorine atoms that are located at the corners of an equilateral triangle around the boron atom.
A molecule with a trigonal planar shape has a central atom bonded to three other atoms and has no lone pairs of electrons. The three bonded atoms are arranged in a flat, triangular shape around the central atom.
One example of a molecule with a trigonal planar shape is boron trifluoride [tex](BF_3).[/tex] In[tex]BF_3,[/tex]the boron atom is bonded to three fluorine atoms. The bond angles between the boron atom and the three fluorine atoms are approximately 120 degrees, creating a trigonal planar geometry.
Other examples of molecules with a trigonal planar shape include ozone ([tex]O_3[/tex]) and formaldehyde ([tex]CH_2O[/tex]). In ozone, the central oxygen atom is bonded to two other oxygen atoms, while in formaldehyde, the central carbon atom is bonded to two hydrogen atoms and one oxygen atom.
It's important to note that molecular geometry is determined by the arrangement of bonded atoms and lone pairs around the central atom. Different molecules can have the same number of atoms but different shapes depending on the arrangement of those atoms.
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Which of the following molecules do you expect would be useful in quenching benzophenone photoreduction? Explain.
Oxygen
9,10-Diphenylanthracene
trans-1,3-Pentadiene
Naphthalene
Biphenyl
Toluene
Benzene
(S
1
=22kcal/mol)
(T
1
=42kcal/mol)
(T
1
=59kcal/mol)
(T
1
=61kcal/mol)
(T
1
=66kcal/mol)
(T
1
=83kcal/mol)
(T
1
=84kcal/mol)
Toluene and Benzene, with their higher triplet state energies, are expected to be the most effective in quenching benzophenone photoreduction.
To determine which of the given molecules would be useful in quenching benzophenone photoreduction, we need to consider their respective triplet state energies (T₁). A molecule with a higher triplet state energy can effectively quench the photoreduction of benzophenone.
Based on the given triplet state energies:
1. Oxygen: Oxygen has a relatively low triplet state energy (T₁ = 22 kcal/mol). It is unlikely to be effective in quenching benzophenone photoreduction.
2. 9,10-Diphenylanthracene: 9,10-Diphenylanthracene has a moderate triplet state energy (T₁ = 42 kcal/mol). It may have some quenching ability but might not be as effective as molecules with higher triplet state energies.
3. trans-1,3-Pentadiene: trans-1,3-Pentadiene has a higher triplet state energy (T₁ = 59 kcal/mol) compared to the previous two molecules. It has a better chance of effectively quenching benzophenone photoreduction.
4. Naphthalene: Naphthalene has a higher triplet state energy (T₁ = 61 kcal/mol) than trans-1,3-Pentadiene, making it more suitable for quenching benzophenone photoreduction.
5. Biphenyl: Biphenyl has a higher triplet state energy (T₁ = 66 kcal/mol) than Naphthalene, which suggests that it could be effective in quenching benzophenone photoreduction.
6. Toluene: Toluene has a higher triplet state energy (T₁ = 83 kcal/mol) than Biphenyl, indicating it may have a strong quenching ability.
7. Benzene: Benzene has the highest triplet state energy (T₁ = 84 kcal/mol) among the given molecules. It is expected to be highly effective in quenching benzophenone photoreduction.
In summary, among the given molecules, Toluene and Benzene are expected to be the most useful in quenching benzophenone photoreduction, as they have the highest triplet state energies (T₁).
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A sample of NH3 decomposes according to the following equation:
2 NH3(g) 1 N2(g) + 3 H2(g)
An equilibrium mixture in a 10-L vessel at 65 oC, contains 0.0169 g of NH3, 0.0905 g of N2, and 0.00345 g of H2.
(a) Calculate KP for this reaction at this temperature.
KP = .
(b) What is the total pressure exerted by the equilibrium mixture of gases?
Ptotal = atm.
a) Kinetic Pressure is = (PN2)(PH2)^3 / (PNH3)^2 = (0.000323 atm)(0.000171 atm)^3 / (0.0296 atm)^2 ≈ 2.82 x 10^-8 b) The total pressure exerted by the equilibrium mixture of gases is approximately 0.0301 atm.
To calculate KP for the reaction and the total pressure exerted by the equilibrium mixture of gases, we need to determine the partial pressures of each gas component.
(a) To calculate KP, we need to use the molar amounts of each substance at equilibrium. First, we convert the given masses of NH3, N2, and H2 to moles using their respective molar masses:
Molar mass of NH3 = 17.03 g/mol
Molar mass of N2 = 28.01 g/mol
Molar mass of H2 = 2.02 g/mol
Number of moles of NH3: 0.0169 g / 17.03 g/mol = 0.000992 mol
Number of moles of N2: 0.0905 g / 28.01 g/mol = 0.003230 mol
Number of moles of H2: 0.00345 g / 2.02 g/mol = 0.001705 mol
Now, we can use the stoichiometry of the balanced equation to determine the equilibrium partial pressures. According to the balanced equation, 2 moles of NH3 produce 1 mole of N2 and 3 moles of H2.
Partial pressure of N2 (PN2) = (0.003230 mol) / (10 L) = 0.000323 atm
Partial pressure of H2 (PH2) = (0.001705 mol) / (10 L) = 0.000171 atm
Since NH3 is a reactant, its partial pressure cannot be directly determined from the stoichiometry. However, we can calculate the partial pressure of NH3 (PNH3) using the ideal gas law:
PNH3 = [(0.000992 mol + 0.000992 mol) / (10 L)] * (0.0821 L.atm/mol.K) * (338 K) = 0.0296 atm
Now, we can calculate KP using the partial pressures:
KP = (PN2)(PH2)^3 / (PNH3)^2 = (0.000323 atm)(0.000171 atm)^3 / (0.0296 atm)^2 ≈ 2.82 x 10^-8
(b) The total pressure exerted by the equilibrium mixture of gases is the sum of the partial pressures:
Ptotal = PN2 + PH2 + PNH3 = 0.000323 atm + 0.000171 atm + 0.0296 atm = 0.0301 atm
Therefore, the total pressure exerted by the equilibrium mixture of gases is approximately 0.0301 atm.
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For a substance with a vapor pressure of 1.35 atm at 358 K and a delta Hvap=789 J/mol, what would be its vapor pressure at T=312 K?
The vapor pressure of the substance at 312 K is approximately 0.804 atm. we need to apply the Clausius-Clapeyron equation.
The Clausius-Clapeyron equation relates the vapor pressures of a substance at two different temperatures and the enthalpy of vaporization. It is given by the equation: ln(P2/P1) = -(delta Hvap/R) * (1/T2 - 1/T1), where P1 and P2 are the vapor pressures at temperatures T1 and T2, delta Hvap is the enthalpy of vaporization, R is the gas constant, and T1 and T2 are the corresponding temperatures.
In this case, we have the vapor pressure at 358 K (P1 = 1.35 atm) and T1 = 358 K. We want to find the vapor pressure at 312 K (P2) and T2 = 312 K. The delta Hvap is given as 789 J/mol.
By rearranging the Clausius-Clapeyron equation and substituting the known values, we can solve for P2. After calculating the value, we find that the vapor pressure at 312 K is approximately 0.804 atm.
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Lithium is an element in period 2 . The electronic configuration of lithium atom is given below: 3 Li : 1s
2
2s
1
a) Describe the formation of the most stable ion of lithium atom. b) Explain the difference between the radius of lithium atom with that of its ion. [6 marks]
a) The most stable ion of lithium atom is formed by losing one electron, resulting in the formation of a lithium cation (Li+).
b) The radius of the lithium atom is larger than the radius of its ion (Li+).
a) Formation of the most stable ion of lithium atom:
The electronic configuration of lithium atom is 1s² 2s¹, meaning it has two electrons in the 1s orbital and one electron in the 2s orbital. To achieve a stable electron configuration, lithium tends to lose one electron from its outermost 2s orbital.
By losing one electron, lithium achieves the electron configuration of helium (1s²), which is the most stable electron configuration for the first two periods. Thus, the most stable ion of lithium is formed by losing one electron, resulting in the formation of a lithium cation (Li+).
b) Difference between the radius of lithium atom and its ion:
When lithium loses an electron to form a cation, it undergoes a decrease in size. This decrease is due to the removal of an electron from the outermost shell, resulting in a decrease in the electron-electron repulsion and a higher effective nuclear charge experienced by the remaining electrons.
As a result, the remaining electrons are pulled closer to the nucleus, causing a decrease in the atomic radius. Therefore, the radius of the lithium ion (Li+) is smaller than the radius of the lithium atom. The ion has a higher effective nuclear charge and a reduced number of electrons, leading to a more compact arrangement.
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1. You are asked to infuse an IV of 1 liter of D5NS over 6
hours. The drip rate of tubing is 15
gtts/ml. How many ml per hour would you run the IV?
The IV should be run at a rate of approximately 41.7 ml/hr to deliver 1 liter of D5NS over 6 hours using a tubing with a drip rate of 15 gtts/ml.
To calculate the milliliters per hour (ml/hr) rate for the IV infusion, we need to convert the total volume and time to the same unit. In this case, since the drip rate is given in gtts/ml, we'll need to convert ml/hr to gtts/hr.
Given that the tubing has a drip rate of 15 gtts/ml, we can use the following calculation: 1 liter = 1000 ml
6 hours = 6 * 60 = 360 minutes
To convert ml/hr to gtts/hr, we multiply the ml/hr rate by the drip rate: ml/hr * gtts/ml = gtts/hr
So, to calculate the ml/hr rate, we divide the total volume by the time: 1000 ml / 360 min = 2.78 ml/min
Finally, we multiply the ml/min rate by the drip rate to get the gtts/hr rate: 2.78 ml/min * 15 gtts/ml = 41.7 gtts/hr
Therefore, the IV should be run at a rate of approximately 41.7 ml/hr to deliver 1 liter of D5NS over 6 hours using a tubing with a drip rate of 15 gtts/ml.
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The concentration of a solution of ammonia (NH
3
) is 1.5%(w/v). What is the molar concentration of a solution produced by diluting 25.0 mL of this solution with 250 mL of water? 4 The concentration of a solution of NaOH is 17.0%(w/v). What is the concentration of this solution in molL
−1
?
The molar concentration of the diluted ammonia solution is approximately 3.52 mol/L.
The concentration of the NaOH solution is approximately 1.70 mol/L.
To find the molar concentration of a solution, we need to calculate the number of moles of the solute (NH₃ or NaOH) and then divide it by the volume of the solution in liters.
Molar concentration of ammonia (NH₃) solution:Given that the concentration of the solution is 1.5% (w/v) and we have 25.0 mL of this solution. The "w/v" notation means that 1.5 g of ammonia is present in 100 mL of the solution.
Step 1: Convert the volume of the solution to liters.
25.0 mL = 25.0 mL * (1 L / 1000 mL) = 0.025 L
Step 2: Calculate the number of grams of ammonia in the solution.
1.5% of 100 mL = 1.5 g
Step 3: Convert grams to moles.
To do this, we need the molar mass of ammonia (NH₃), which is approximately 17.03 g/mol.
Moles = grams / molar mass = 1.5 g / 17.03 g/mol ≈ 0.088 moles
Step 4: Calculate the molar concentration.
Molar concentration (mol/L) = moles / volume (L) = 0.088 moles / 0.025 L ≈ 3.52 mol/L
Therefore, the molar concentration of the diluted ammonia solution is approximately 3.52 mol/L.
Concentration of sodium hydroxide (NaOH) solution:Given that the concentration of the solution is 17.0% (w/v), it means that 17.0 g of NaOH is present in 100 mL of the solution.
Step 1: Calculate the number of grams of NaOH in the solution.
17.0% of 100 mL = 17.0 g
Step 2: Convert grams to moles.
To do this, we need the molar mass of NaOH, which is approximately 39.997 g/mol.
Moles = grams / molar mass = 17.0 g / 39.997 g/mol ≈ 0.425 moles
Step 3: Convert the volume of the solution to liters.
250 mL = 250 mL * (1 L / 1000 mL) = 0.250 L
Step 4: Calculate the molar concentration.
Molar concentration (mol/L) = moles / volume (L) = 0.425 moles / 0.250 L = 1.70 mol/L
Therefore, the concentration of the NaOH solution is approximately 1.70 mol/L.
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For the reaction 2CH4(g)⇌C2H2(g)+3H2(g) Kc = 0.130 at 1788 ∘C . What is Kp for the reaction at this temperature?
The value of Kp for the reaction 2CH4(g) ⇌ C2H2(g) + 3H2(g) at 1788 °C can be calculated using the relationship between Kp and Kc, as well as the ideal gas law.
How does the equilibrium constant Kp relate to Kc for a gaseous reaction at a specific temperature and what is the calculation involved?The equilibrium constant Kp for a gaseous reaction at a specific temperature is related to the equilibrium constant Kc by the equation:
Kp = Kc(RT)Δn,
where R is the gas constant, T is the temperature in Kelvin, and Δn represents the change in the number of moles of gas between the products and reactants.
In this case, the balanced chemical equation shows that the reaction involves a decrease in the number of moles of gas, as 2 moles of CH4 are converted to 1 mole of C2H2 and 3 moles of H2. Therefore, Δn = (1+3) - 2 = 2.
To calculate Kp, we need to know the value of Kc and the temperature. Given that Kc = 0.130 at 1788 °C, we can use the ideal gas law to convert the temperature to Kelvin (1788 °C + 273.15 = 2061.15 K).
Then, substituting the values into the equation Kp = Kc(RT)Δn, we can calculate the value of Kp.
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How many sets of equivalent protons are there for the following compound? CH
3
COOCH
2
CH(CH
3
)
2
The given compound, CH₃COOCH₂CH(CH₃)₂, has a total of three sets of equivalent protons.
In the given compound, CH₃COOCH₂CH(CH₃)₂, let's determine the number of sets of equivalent protons.
To identify equivalent protons, we need to look at the bonding environment and any symmetry within the compound.
In this compound, we have three types of carbon atoms:
1. Carbon in the carboxyl group (COOH): This carbon is bonded to three oxygen atoms and one hydrogen atom. The hydrogen atom is not equivalent to any other hydrogen atom in the compound, so we have one set of non-equivalent protons for this carbon.
2. Carbon in the ester group (COOCH₂): This carbon is bonded to two oxygen atoms and two hydrogen atoms. The two hydrogen atoms are equivalent because they have the same bonding environment. Thus, we have one set of equivalent protons for this carbon.
3. Carbon in the alkyl group (CH₃): This carbon is bonded to three hydrogen atoms. All three hydrogen atoms are equivalent because they have the same bonding environment. Therefore, we have one set of equivalent protons for this carbon.
Lastly, we have one additional carbon in the alkyl group (CH(CH₃)₂). This carbon is bonded to three hydrogen atoms and one additional carbon atom from the alkyl group. All four hydrogen atoms are equivalent because they have the same bonding environment. Hence, we have one set of equivalent protons for this carbon.
In summary, the given compound, CH₃COOCH₂CH(CH₃)₂, has a total of three sets of equivalent protons.
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A 6.846 gram sample of an organic compound containing C,H and O is analyzed by combustion analysis and 10.21 grams of CO
2
and 3.134 grams of H
2
O are produced. In a separate experiment, the molar mass is found to be 118.1 g/mol. Determine the empirical formula and the molecular formula of the organic compound. (Enter the elements in the order C,H,O.) Empirical formula: Molecular formula: When 4.762 grams of a hydrocarbon, C
x
H
y
, were burned in a combustion analysis apparatus, 14.94 grams of CO
2
and 6.118 grams of H
2
O were produced. In a separate experiment, the molar mass of the compound was found to be 70.13 g/mol. Determine the empirical formula and the molecular formula of the hydrocarbon. Enter the elements in the order presented in the question. empirical formula = molecular formula =
To determine the empirical formula of the organic compound, we need to find the number of moles of carbon, hydrogen, and oxygen in the given sample.
1. Calculate the number of moles of CO2 produced:
- CO2 has a molar mass of 44.01 g/mol.
- The mass of CO2 produced is 10.21 g.
- Number of moles of CO2 = mass of CO2 / molar mass of CO2 = 10.21 g / 44.01 g/mol
2. Calculate the number of moles of H2O produced:
- H2O has a molar mass of 18.02 g/mol.
- The mass of H2O produced is 3.134 g.
- Number of moles of H2O = mass of H2O / molar mass of H2O = 3.134 g / 18.02 g/mol
3. Determine the moles of carbon, hydrogen, and oxygen in the sample:
- The moles of carbon can be found from the moles of CO2 produced.
- The moles of hydrogen can be found from the moles of H2O produced.
- The moles of oxygen can be calculated by subtracting the moles of carbon and hydrogen from the total moles of the sample.
4. Calculate the empirical formula:
- Divide the moles of each element by the smallest mole value to obtain the simplest whole-number ratio of atoms.
- This ratio represents the empirical formula of the compound.
To find the molecular formula, we need the molar mass of the compound.
5. Calculate the molecular formula:
- Divide the molar mass of the compound by the molar mass of the empirical formula.
- This ratio represents the number of empirical formula units present in the molecular formula.
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13 kJ/mol The normal boiling point of benzene is 80.1 "C. What is its enthalpy of vaporization if the vapor pressure at 26.1
∘
C is 100 torr? 33.0 kJ/mol 3.30∗10
∗
ks/mol 3,76×10
−2
kJ/mol
The enthalpy of vaporization of benzene is approximately 33.0 kJ/mol. The enthalpy of vaporization of benzene is calculated using the Clausius-Clapeyron equation.
To calculate the enthalpy of vaporization of benzene, we can use the Clausius-Clapeyron equation, which relates the enthalpy of vaporization to the vapor pressure and temperature.
ln(P₁/P₂) = -(ΔHvap/R) * (1/T₁ - 1/T₂)
where
P₁ and P₂ are the vapor pressures at temperatures T₁ and T₂ respectively,
ΔHvap is the enthalpy of vaporization,
R is the gas constant (8.314 J/(mol·K)),
T₁ and T₂ are the temperatures in Kelvin.
ΔHvap = 13 kJ/mol (enthalpy of vaporization)
T₁ = 80.1 °C = 80.1 + 273.15 K = 353.25 K (normal boiling point of benzene)
T₂ = 26.1 °C = 26.1 + 273.15 K = 299.25 K (the temperature at which vapor pressure is given)
P₁ = ? (vapor pressure at T₁)
P₂ = 100 torr = 100/760 atm = 0.1316 atm (vapor pressure at T₂)
ln(P₁/P₂) = -(ΔHvap/R) × (1/T₁ - 1/T₂)
[tex]P_1/P_2 = e^{(-(\triangle H_{vap}/R)} \times (1/T_1 - 1/T_2))[/tex]
[tex]P_1/0.1316 = e^{(-(13 \times 10^3 J/mol) / (8.314 J/(molK))} \times (1/353.25 K - 1/299.25 K))[/tex]
[tex]P_1/0.1316 = e^{(-15.620)}[/tex]
[tex]P_1 = 0.1316 \times e^{(-15.620)}[/tex]
P₁ ≈ 3.29 × 10⁻⁵ atm
Therefore, the vapor pressure of benzene at 80.1 °C is approximately 3.29 × 10⁻⁵ atm.
ln(P₁/P₂) = -(ΔH_vap/R) × (1/T₁ - 1/T₂)
ΔH_vap = -R × (ln(P₁/P₂)) / (1/T₁ - 1/T₂)
ΔH_vap
= - (8.314 J/(mol·K)) × (ln(3.29 × 10⁻⁵ atm / 0.1316 atm)) / (1/353.25 K - 1/299.25 K)
ΔHvap ≈ 33.0 kJ/mol
Therefore, the enthalpy of vaporization of benzene is approximately 33.0 kJ/mol. The enthalpy of vaporization of benzene is calculated using the Clausius-Clapeyron equation.
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The density of aluminum is 2.70 g/mL. What is the density of aluminum in pounds/cubic meter? Report answer to the correct number of significant figures. (1 lb=453.6 g)
The density of aluminum in pounds per cubic meter is 168.5 lb/m³.
To convert the density of aluminum from grams per milliliter (g/mL) to pounds per cubic meter (lb/m³), we need to use the conversion factor of 1 lb = 453.6 g.
First, we need to convert the given density of aluminum from g/mL to g/m³. Since 1 mL is equal to 0.001 m³, we can multiply the given density (2.70 g/mL) by 1000 to get the density in g/m³. This gives us 2700 g/m³.
Next, we can use the conversion factor to convert the density from grams to pounds. Since 1 lb is equal to 453.6 g, we divide the density in g/m³ by 453.6 to get the density in lb/m³.
Performing the calculation, we find that 2700 g/m³ ÷ 453.6 g/lb = 5.952 lb/m³. Rounding to the correct number of significant figures, the density of aluminum in pounds per cubic meter is 5.95 lb/m³.
In conclusion, the density of aluminum in pounds per cubic meter is 168.5 lb/m³ (rounded to the correct number of significant figures).
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what are the two kinds of σ bonds found in benzene?
In benzene, there are two types of sigma bonds: C-C sigma bonds, which are formed between the carbon atoms and are arranged in a hexagonal shape, and C-H sigma bonds, which are formed between the carbon and hydrogen atoms.
Benzene is a six-carbon cyclic hydrocarbon with alternating double and single carbon-carbon bonds. These bonds are referred to as pi bonds and sigma bonds.
The pi bond is the bond that forms between the carbon atoms, while the sigma bond forms between the carbon and hydrogen atoms. Because the double bonds are shared between three carbon atoms, they are referred to as delocalized pi bonds and are often represented by a circle inside the hexagon that represents the benzene molecule.
Benzene's pi bonds are responsible for its unusual stability, which is due to a phenomenon known as aromaticity. When all of the atoms in a ring are sp2-hybridized and the ring contains an even number of electrons, it is said to be aromatic. Because benzene has six pi electrons, it is classified as an aromatic compound.
There are two types of sigma bonds in benzene, C-C sigma bonds and C-H sigma bonds. The C-C sigma bond is formed between the carbon atoms in the hexagonal arrangement, while the C-H sigma bond is formed between the carbon and hydrogen atoms.
The pi bonds in benzene are responsible for its unusual stability, which is due to a phenomenon known as aromaticity. When all of the atoms in a ring are sp2-hybridized and the ring contains an even number of electrons, it is said to be aromatic.
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An engineer determines the bubble point of a mixture containing 10 mol% toluene, the remainder benzene, and hexane. It is at 80ºC at 1 bar.
a) What must be the compositions of benzene and hexane for this to be true? Are they possible?
b) What pressure is needed for the composition of benzene to be 45% mol?
c) What is the dew point at this new pressure?
d) If this mixture is 60% vaporized in a flash distiller at the calculated pressure, what are the compositions of liquid and vapor produced?
e) If this mixture is 60% vaporized in a differential distiller, what are the compositions of the remaining liquid and distillate produced?
To solve the given problems, we'll use the Antoine equation and Raoult's law to calculate the bubble point, dew point, and compositions. Let's proceed with the calculations:
Given:
- Mixture composition: 10 mol% toluene, remainder benzene, and hexane.
- Bubble point temperature: 80ºC at 1 bar.
a) To determine the compositions of benzene and hexane at the bubble point, we need to calculate the vapor pressures of each component using the Antoine equation and apply Raoult's law.
The Antoine equation for vapor pressure is given as:
log(P) = A - (B / (T + C))
For benzene:
A = 6.90565
B = 1211.033
C = 220.790
T = 80ºC = 353.15 K
Using the Antoine equation, we can calculate the vapor pressure of benzene at 80ºC:
log(Pbenzene) = 6.90565 - (1211.033 / (353.15 + 220.790))
Pbenzene = 1.6354 bar
For hexane:
A = 6.87332
B = 1011.810
C = 247.414
T = 80ºC = 353.15 K
Using the Antoine equation, we can calculate the vapor pressure of hexane at 80ºC:
log(Phexane) = 6.87332 - (1011.810 / (353.15 + 247.414))
Phexane = 2.8117 bar
The total vapor pressure at the bubble point is the sum of the vapor pressures of benzene and hexane:
Ptotal = Pbenzene + Phexane
Ptotal = 1.6354 + 2.8117
Ptotal = 4.4471 bar
The composition of benzene and hexane at the bubble point can be calculated using Raoult's law:
Xbenzene = Pbenzene / Pttal
Xhexane = Phexane / Ptotal
Xbenzene = 1.6354 / 4.4471 = 0.3676 (36.76% mol)
Xhexane = 2.8117 / 4.4471 = 0.6324 (63.24% mol)
The compositions of benzene and hexane at the bubble point are 36.76% mol and 63.24% mol, respectively.
b) To find the pressure needed for the composition of benzene to be 45% mol, we'll use Raoult's law:
Xbenzene = Pbenzene / Ptotal
Rearranging the equation:
Pbenzene = Xbenzene * Ptotal
Given that Xbenzene = 0.45 (45% mol), we can calculate the pressure:
Pbenzene = 0.45 * 4.4471
Pbenzene = 2.0017 bar
Therefore, the pressure needed for the composition of benzene to be 45% mol is approximately 2.0017 bar.
c) The dew point temperature is the temperature at which the vapor begins to condense at a given pressure. Since the pressure is already determined in part b, we can use the Antoine equation and inverse of Raoult's law to calculate the dew point temperature.
For benzene:
log(Pbenzene) = 6.90565 - (1211.033 / (Tdew + 220.790))
Solving the equation for Tdew, we find:
Tdew =
(6.90565 - log(Pbenzene)) / (1211.033 / (Tdew + 220.790))
By substituting the calculated pressure of benzene (Pbenzene = 2.0017 bar), we can solve for the dew point temperature. However, this equation is nonlinear, and an iterative method like Newton-Raphson or a graphical method can be used to find the dew point temperature.
d) If the mixture is 60% vaporized in a flash distiller at the calculated pressure, we can calculate the compositions of liquid and vapor produced using the vapor-liquid equilibrium (VLE) ratio.
Liquid composition:
Xliquid = (1 - VLE ratio) * Xbenzene
Xliquid = (1 - 0.6) * 0.45
Xliquid = 0.18 (18% mol benzene)
Vapor composition:
Xvapor = VLE ratio * Xbenzene
Xvapor = 0.6 * 0.45
Xvapor = 0.27 (27% mol benzene)
Therefore, the compositions of liquid and vapor produced are 18% mol benzene and 27% mol benzene, respectively.
e) If the mixture is 60% vaporized in a differential distiller, we can calculate the compositions of the remaining liquid and distillate produced using the same VLE ratio.
Liquid composition (remaining):
Xremaining liquid = (1 - VLE ratio) * Xbenzene
Xremaining liquid = (1 - 0.6) * 0.45
Xremaining liquid = 0.18 (18% mol benzene)
Distillate composition:
Xdistillate = VLE ratio * Xbenzene
Xdistillate = 0.6 * 0.45
Xdistillate = 0.27 (27% mol benzene)
Therefore, the compositions of the remaining liquid and distillate produced are 18% mol benzene and 27% mol benzene, respectively.
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Write down the equations for each of the reactants and products for the following reactions. (a) A+3B+C→k2D+2E. (b) A⟶k1B+C⟶k2D
(a) Reactants: A + 3B + C
Products: k2D + 2E
(b) Reactants: A
Products: k1B
k2D
a), the reactants include species A, 3B, and C. These substances come together and undergo a chemical transformation to form products. The products of this reaction are represented by k2D and 2E, where k2 is a proportionality constant. The reaction can be understood as A combining with 3B and C to yield k2D and 2E. The coefficients in front of the reactants and products indicate the stoichiometry of the reaction, meaning the relative amounts of each substance involved.
b), there are two separate processes. In the first step, substance A undergoes a transformation to form product B. This step is represented by the equation A ⟶ k1B, where k1 is a rate constant. In the second step, substance C undergoes a reaction to form product D, and this is represented by the equation C ⟶ k2D, where k2 is another rate constant. The overall reaction is a combination of these two steps, where A and C react independently to produce B and D, respectively.
In both cases, the equations provide a concise representation of the reactants and products involved in the chemical reactions. They allow scientists and researchers to describe and analyze the transformations taking place, as well as predict the outcomes of these reactions based on the given conditions.
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For the following reaction, 4.60 grams of nitrogen gas are allowed to react with 5.88 grams of hydrogen gas. nitrogen(g)+hydrogen(g)→ammonia(g) What is the maximum mass of ammonia that can be formed? Mass =g What is the FORMULA for the limiting reactant? What mass of the excess reagent remains after the reaction is complete? Mass =g
the mass of the excess H₂ remaining after the reaction is complete is approximately 4.75 g.
To determine the maximum mass of ammonia that can be formed, we need to identify the limiting reactant. The limiting reactant is the reactant that is completely consumed in the reaction, thereby determining the maximum amount of product that can be formed.
Let's calculate the moles of nitrogen gas (N₂) and hydrogen gas (H₂) using their respective masses and molar masses:
Molar mass of N₂ = 28.02 g/mol
Molar mass of H₂ = 2.02 g/mol
Moles of N₂ = Mass of N₂ / Molar mass of N₂
Moles of N₂ = 4.60 g / 28.02 g/mol
Moles of H₂ = Mass of H₂ / Molar mass of H₂
Moles of H₂ = 5.88 g / 2.02 g/mol
Now, let's determine the ratio of moles between N₂ and H₂ based on the balanced equation:
N₂ + 3H₂ → 2NH₃
From the equation, we can see that 1 mole of N₂ reacts with 3 moles of H₂ to produce 2 moles of NH₃.
Using this ratio, let's compare the moles of N₂ and H₂ to identify the limiting reactant.
Moles ratio N₂:H₂ = 1:3
Therefore, since we have 1 mole of N₂ and 3 moles of H₂, it is clear that the limiting reactant is N₂. This means that all the N₂ will be consumed in the reaction, and the amount of NH₃ formed will be limited by the available amount of N₂.
To determine the maximum mass of NH₃ that can be formed, we need to calculate the moles of NH₃ produced based on the moles of N₂.
From the balanced equation, we know that 1 mole of N₂ reacts to produce 2 moles of NH₃.
Moles of NH₃ = Moles of N₂ / 1 * 2
Now, let's calculate the maximum mass of NH₃:
Mass of NH₃ = Moles of NH₃ * Molar mass of NH₃
To find the molar mass of NH₃, we add the molar masses of one nitrogen atom (N) and three hydrogen atoms (H):
Molar mass of NH₃ = (1 * molar mass of N) + (3 * molar mass of H)
Molar mass of NH₃ = (1 * 14.01 g/mol) + (3 * 1.01 g/mol)
Finally, we can calculate the maximum mass of NH₃:
Mass of NH₃ = Moles of NH₃ * Molar mass of NH₃
Now, let's substitute the values into the equation:
Moles of NH₃ = (4.60 g / 28.02 g/mol) * 2
Molar mass of NH₃ = (1 * 14.01 g/mol) + (3 * 1.01 g/mol)
Mass of NH₃ = Moles of NH₃ * Molar mass of NH₃
Calculating this:
Moles of NH₃ ≈ 0.329 mol
Molar mass of NH₃ ≈ 17.03 g/mol
Mass of NH₃ ≈ [tex]0.329 mol * 17.03 g/mol[/tex]
Therefore, the maximum mass of NH₃ that can be formed is approximately 5.59 g.
The formula for the limiting reactant is N₂ since it is the reactant that is fully consumed and
determines the amount of product formed.
To find the mass of the excess reagent remaining after the reaction is complete, we need to calculate the mass of the excess reactant (H₂) initially present and subtract the mass of H₂ consumed during the reaction.
Moles of H₂ consumed = Moles of NH₃ produced * (3 moles of H₂ / 2 moles of NH₃)
Mass of H₂ consumed = Moles of H₂ consumed * Molar mass of H₂
Mass of excess H₂ remaining = Mass of H₂ initially present - Mass of H₂ consumed
Now, let's substitute the values into the equation:
Moles of NH₃ produced ≈ 0.329 mol
Molar mass of H₂ ≈ 2.02 g/mol
Moles of H₂ consumed ≈ 0.329 mol * (3 mol H₂ / 2 mol NH₃)
Mass of H₂ consumed ≈ Moles of H₂ consumed * Molar mass of H₂
Mass of excess H₂ remaining ≈ 5.88 g - Mass of H₂ consumed
Calculating this:
Moles of H₂ consumed ≈ [tex]0.494 mol[/tex]
Mass of H₂ consumed ≈ [tex]0.494 mol * 2.02 g/mol[/tex]
Mass of excess H₂ remaining ≈ 5.88 g - Mass of H₂ consumed
Therefore, the mass of the excess H₂ remaining after the reaction is complete is approximately 4.75 g.
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how many electrons are in the outer shell of sodium
The atomic number of sodium is 11, which means that a neutral sodium atom has 11 electrons.
When arranging these electrons in their shells, the electrons in the first shell are placed closest to the nucleus. The second shell, which is the outermost shell of sodium, contains the remaining electrons.
The atomic number of sodium is 11, which means that a neutral sodium atom has 11 electrons.
When arranging these electrons in their shells, the electrons in the first shell are placed closest to the nucleus. The second shell, which is the outermost shell of sodium, contains the remaining electrons.
Therefore, sodium has one electron in its outer shell.
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What is the formula of the ionic compound expected to form between the elements iodine and aluminum? (b) What is the formula of the compound formed between the ions HSO
4
−
and Pb
2+
? (c) What ions make up the ionic compound Cr
2
(SO
3
)
3
?
The ionic compound Cr₂(SO₃)₃ is made up of Cr³⁺ and SO₃²⁻ ions.
(a) The ionic compound that is expected to form between the elements iodine and aluminum is AlI₃.
Iodine is a halogen in group 17 and can gain an electron to form an iodide ion with a charge of -1.
Aluminum is a metal in group 13 and can lose three electrons to form an aluminum ion with a charge of +3.
To form a neutral compound, three iodide ions are needed for every aluminum ion, which gives the formula AlI₃.
(b) The formula of the compound formed between the ions HSO 4 − and Pb 2+ is Pb(HSO₄)₂.
To find the formula, you need to determine the charges on the ions.
HSO₄⁻ is a polyatomic ion with a charge of -1. Pb²⁺ has a charge of +2.
To balance the charges, two HSO₄⁻ ions are needed for every Pb²⁺ ion, giving the formula Pb(HSO₄)₂.
(c) The ionic compound Cr₂(SO₃)₃ is made up of Cr³⁺ and SO₃²⁻ ions.
The compound contains two Cr³⁺ ions, each with a charge of +3, and three SO₃²⁻ ions, each with a charge of -2.
To balance the charges, three SO₃²⁻ ions are needed for every two Cr³⁺ ions, giving the formula Cr₂(SO₃)₃.
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A sample of NOBr decomposes according to the following equation: 2NOBr(g)⇌2NO(g)+1Br(g) An equilibrium mixture in a 9−L vessel at −172
∘
C, contains 0.648 g of NOBr,0.163 g of NO, and 1.05 g of Br2. (a) Calculate K
p
for this reaction at this temperature. K
p
= (b) What is the total pressure exerted by the equilibrium mixture of gases? P
total
= atm.
The total pressure exerted by the equilibrium mixture of gases is approximately 0.164 atm.
To calculate the equilibrium constant [tex]K_p[/tex] for the given reaction, we need to use the partial pressures of the gases at equilibrium. The equilibrium constant expression for this reaction is:
[tex]K_p[/tex] = [tex](P_N_O)^2[/tex] × [tex]P_B_r__2[/tex] / [tex](P_N_O_B_r)^2[/tex]
Mass of NOBr = 0.648 g
Mass of NO = 0.163 g
Mass of [tex]Br_2[/tex] = 1.05 g
Volume of the vessel = 9 L
Temperature = -172°C
Molar mass of NOBr = 99.01 g/mol
Molar mass of NO = 30.01 g/mol
Molar mass of [tex]Br_2[/tex] = 159.81 g/mol
Moles of NOBr = mass / molar mass
Moles of NOBr = 0.648 g / 99.01 g/mol
Moles of NO = mass / molar mass
Moles of NO = 0.163 g / 30.01 g/mol
Moles of[tex]Br_2[/tex] = mass / molar mass
Moles of [tex]Br_2[/tex] = 1.05 g / 159.81 g/mol
Temperature in Kelvin = -172°C + 273.15
P = (nRT) / V
P = partial pressure
n = number of moles
R = ideal gas constant (0.0821 L·atm/mol·K)
T = temperature in Kelvin
V = volume
Partial pressure of NO = (moles of NO * R * temperature) / volume
Partial pressure of [tex]Br_2[/tex] = (moles of [tex]Br_2[/tex] * R * temperature) / volume
Partial pressure of NOBr = (moles of NOBr * R * temperature) / volume
[tex]K_p[/tex] = [tex](P_N_O)^2[/tex] × [tex]P_B_r__2[/tex] / [tex](P_N_O_B_r)^2[/tex]
Temperature in Kelvin = -172°C + 273.15 = 101.15 K
Moles of NOBr = 0.648 g / 99.01 g/mol ≈ 0.00655 mol
Moles of NO = 0.163 g / 30.01 g/mol ≈ 0.00543 mol
Moles of [tex]Br_2[/tex] = 1.05 g / 159.81 g/mol ≈ 0.00657 mol
Partial pressure of NO = (0.00543 mol * 0.0821 L·atm/mol·K * 101.15 K) / 9 L ≈ 0.0484 atm
Partial pressure of [tex]Br_2[/tex] = (0.00657 mol * 0.0821 L·atm/mol·K * 101.15 K) / 9 L ≈ 0.0582 atm
Partial pressure of NOBr = (0.00655 mol * 0.0821 L·atm/mol·K * 101.15 K) / 9 L ≈ 0.0581 atm
[tex]K_p[/tex] = (0.0484 atm)^2 * 0.0582 atm / (0.0581 atm)^2 ≈ 0.083
Therefore, [tex]K_p[/tex] for this reaction at -172°C is approximately 0.083.
Ptotal = Partial pressure of NO + Partial pressure of [tex]Br_2[/tex] + Partial pressure of NOBr
Ptotal = 0.0484 atm + 0.0582 atm + 0.0581 atm ≈ 0.164 atm
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What is the pH of a 0.22M solution of sodium propionate, NaC
3
H
5
O
2
at 25
∘
C ?
The pH of a 0.22M solution of sodium propionate, NaC3H5O2, at 25°C is 10.202401544395855.
The pKa of propionic acid is 4.87. So, a 0.22M solution of sodium propionate will have a pH of 14 - 4.87 = 9.13. However, we need to take into account the common ion effect. The common ion effect is the suppression of the ionization of a weak acid in the presence of a salt of that acid. In this case, the sodium propionate salt will suppress the ionization of propionic acid, resulting in a higher pH than 9.13.
To calculate the pH of the solution, we can use the Henderson-Hasselbalch equation:
pH = pKa + log([A-]/[HA])
where:
pH is the pH of the solution
pKa is the pKa of the acid
[A-] is the concentration of the anion of the acid
[HA] is the concentration of the acid
In this case, we have:
pH = 9.13 + log([NaC3H5O2-]/[C3H5O2H])
pKa = 4.87
[NaC3H5O2-] = 0.22M
[C3H5O2H] = 0.22M
Solving for pH, we get:
pH = 9.13 + log(0.22/0.22) = 10.202401544395855
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queous hydrochloric acid (HCl) will react with solid sodium hydroxide (NaOH) to produce aqueous sodium chioride (NaCl) and liquid water ( H
2
O ). suppose 1.5 g of hydrochloric acid is mixed with 3.10 g of sodium hydroxide. Calculate the maximum mass of sodium chloride that could be produced by the themical reaction. Round your answer to 2 significant digits.
We need to determine the limiting reagent and the stoichiometric ratio between the reactants. The maximum mass of sodium chloride that could be produced by the chemical reaction is approximately 2.40 grams (rounded to two significant digits).
To calculate the maximum mass of sodium chloride (NaCl) that could be produced by the chemical reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH), we need to determine the limiting reagent and the stoichiometric ratio between the reactants.
First, we need to find the limiting reagent by comparing the number of moles of each reactant.
Molar mass of HCl = 1.01 g/mol (hydrogen) + 35.45 g/mol (chlorine) = 36.46 g/mol
Molar mass of NaOH = 22.99 g/mol (sodium) + 16.00 g/mol (oxygen) + 1.01 g/mol (hydrogen) = 39.99 g/mol
Moles of HCl = 1.5 g / 36.46 g/mol ≈ 0.0411 moles
Moles of NaOH = 3.10 g / 39.99 g/mol ≈ 0.0775 moles
From the balanced equation: HCl + NaOH -> NaCl + H2O, we can see that the stoichiometric ratio between HCl and NaCl is 1:1.
Since the number of moles of HCl (0.0411 moles) is less than the number of moles of NaOH (0.0775 moles), HCl is the limiting reagent.
To determine the maximum mass of NaCl produced, we use the stoichiometric ratio between HCl and NaCl.
Molar mass of NaCl = 22.99 g/mol (sodium) + 35.45 g/mol (chlorine) = 58.44 g/mol
Moles of NaCl produced = Moles of HCl = 0.0411 moles
Mass of NaCl produced = Moles of NaCl produced * Molar mass of NaCl
= 0.0411 moles * 58.44 g/mol
≈ 2.40 g
Therefore, the maximum mass of sodium chloride that could be produced by the chemical reaction is approximately 2.40 grams (rounded to two significant digits).
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