The mass of the precipitate is form when the 70.0ml of 0.80 mol/l potassium hydroxide is added to 40.0ml of a 0.50mol/l iron(iii) nitrate solution is 0.64 g.
The balance reaction is as :
Fe(NO₃)₃(aq) + 3KOH(aq) ---> Fe(OH)₃(s) + 3KNO₃(aq)
The precipitate form = Fe(OH)₃
The molarity of KOH = 0.50 M
The volume = 0.040 L
Moles = molarity × volume
= 0.50 × 0.040
= 0.02 mol
The molarity of Fe(NO₃)₃ = 0.80 M
The volume = 0.07 L
Moles = 0.80 × 0.07
= 0.056 M
1 mole Fe(NO₃)₃ react with 3 moles of KOH
moles of KOH = 3 × 0.056
= 0.168 mol
Therefore, the KOH is the limiting reagent.
3 mole of KOH = 1 mole of Fe(OH)₃
Moles of Fe(OH)₃ = (1/3) × 0.02
= 0.006 mol
The mass of Fe(OH)₃ = 106.8 × 0.006
= 0.64 g
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Which of the terms describe the excerpt heard here and which do not?
Correct: Dissonant, Polyphonic Imitation
Incorrect: Consonant, Homorythmic
The terms "Dissonant" and "Polyphonic Imitation" describe the excerpt heard, while "Consonant" and "Homophonic" do not describe the excerpt.
Dissonant refers to a type of musical sound that is characterized by a combination of tones that clash or conflict with each other, creating a sense of tension or discomfort. The excerpt in question may contain dissonant elements, creating a sense of disharmony or tension in the music.
Polyphonic Imitation refers to a compositional technique in which two or more musical voices imitate each other, creating a sense of overlapping or interweaving musical lines. The excerpt in question may contain elements of polyphonic imitation, in which two or more musical voices are heard imitating each other.
Consonant refers to a type of musical sound that is characterized by a combination of tones that blend or harmonize well with each other, creating a sense of comfort or relaxation. The excerpt in question may not contain consonant elements, and instead may contain elements of dissonance.
Homophonic refers to a type of musical texture in which a single melody is played or sung with accompaniment, creating a clear distinction between the melody and the accompaniment.
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what orbitals are accountable to the law of octaves
The orbitals are accountable to the law of octaves are: 1s 2s 2p 2p 3s 3p 3d 4s 4p 4d 5s 5p 4f 5d 6s 6p 5f 6d 7s .
The law of octaves introduced by the English chemist named J.A.R Newlands. According to it if we arranged the chemical elements in the periodic table according to their atomic mass then those that have the similar physical and the chemical properties will occur after the each interval of the seven elements.
The last element that is known was the thorium with the atomic mass of 232. Newlands' law of octave was firstly applicable only up to the calcium with atomic mass of 40. Now there are more ninety elements known up to the thorium.
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what mass of the lead (ii) hydroxide (solid) could be collected when 22.5 ml of 0.135 m pb(no3)2 solution reacts with excess sodium hydroxide?
The number of moles of lead hydroxide formed is 0.00304 moles. So the mass of lead hydroxide formed will be 0.733g
The balanced reaction between lead nitrate with sodium hydroxide is as follows.
Pb(NO₃)₂ + 2NaOH ⇒ Pb(OH)₂ + 2NaNO₃
So one mole of lead nitrate reacts with 2 moles of sodium hydroxide to give one mole of lead hydroxide and two moles of sodium nitrate. Since sodium hydroxide is in excess, lead nitrate is the limiting agent.
Here it is given that molarity of solution is 0.135 M.
Molarity = Number of moles/ Volume of solution in litres
0.135 = number of moles/ 0.0225 L
Number of moles = 0.135× 0.0225
= 0.00304 moles
So from 0.00304 moles of lead nitrate 0.00304 moles of lead hydroxide is formed.
Molar mass of lead hydroxide = 241.21 g
Mass = Molar mass × number of moles
=241.21 × 0.00304
= 0. 733 g
So 0.733g of lead hydroxide is produced.
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Chemistry help please
an unknown compound contains only c , h , and o . combustion of 8.50 g of this compound produced 19.3 g co2 and 7.91 g h2o . what is the empirical formula of the unknown compound? insert subscripts as needed.\
The empirical formula of the unknown compound is CH2O.
To calculate the empirical formula of the compound, the number of moles of each element in the compound must be calculated. The moles of Carbon (C) can be determined by dividing the mass of CO2 (19.3 g) by the molar mass of CO2 (44 g/mol). This yields 0.437 moles of Carbon.
The moles of Hydrogen (H) can be determined by dividing the mass of H2O (7.91 g) by the molar mass of H2O (18 g/mol). This yields 0.442 moles of Hydrogen.
The moles of Oxygen (O) can be determined by subtracting the moles of Carbon and Hydrogen from the total number of moles in the compound, which is determined by dividing the mass of the compound (8.50 g) by its molar mass (we can assume the molar mass of the compound is equal to the sum of the molar masses of its elements).
This yields 0.125 moles of Oxygen. Once the moles of each element are determined, they can be divided by the smallest number of moles of the three elements (in this case, 0.125 moles of Oxygen) to get the ratio of each element in the compound. This yields a ratio of 3.5 Carbon, 4.4 Hydrogen, and 1 Oxygen. This ratio can be simplified to a whole number ratio of 4 Carbon, 5 Hydrogen, and 1 Oxygen, which is equivalent to the molecular formula CH2O.
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comment on differences between plots of r(r) against r, and 4πr2r(r)2against r foreach of the following atomic orbitals of an h atom: (a) 1s; (b) 4s; (c) 3p.
The plots of radial distribution function (r(r)) against radial distance (r) and 4πr^2r(r)^2 against r for each of the following atomic orbitals provide information about the electron density distribution in the atom.
The differences between the two plots are as follows:
(a) 1s orbital:
The 1s orbital has the highest electron density at the nucleus and decreases as the radial distance increases. The plot of r(r) against r shows the radial distribution function that gives the electron density as a function of radial distance from the nucleus. The plot of 4πr^2r(r)^2 against r shows the volume occupied by the electron density at each radial distance. Both plots will show the same general trend of decreasing electron density with increasing radial distance from the nucleus.
(b) 4s orbital:
The 4s orbital has a lower electron density at the nucleus than the 1s orbital and has more electron density farther from the nucleus. The plot of r(r) against r will show a slower decrease in electron density with increasing radial distance than the 1s orbital. The plot of 4πr^2r(r)^2 against r will show that the volume occupied by the electron density increases faster with increasing radial distance than in the 1s orbital.
(c) 3p orbital:
The 3p orbital has a nodal plane (a plane where the electron density is zero) perpendicular to the orbital axis. The plot of r(r) against r will show two maxima and a minimum at the nodal plane, indicating the electron density distribution in three dimensions. The plot of 4πr^2r(r)^2 against r will show that the volume occupied by the electron density at each radial distance is non-zero and peaks at two maxima.
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To a small 50 ml sample of buffer, 100 ml of concentrated strong base solution are added. You should expect the pH of this solution to: a. Decrease b. Stay the same c. Increase d. Be fully neutralized
The pH of this solution will Increase.An aqueous solution's acidity or basicity is shown on a scale called pH, which stands for "potential of hydrogen" (or "power of hydrogen").
Lower pH values are recorded for acidic solutions than for basic or alkaline solutions (solutions with larger quantities of H+ ions).When modest quantities of acid and alkali are added to a buffer solution, the pH remains constant. The buffer can only withstand so much acid or so much alkali. The buffer capacity is determined by: If you have a weak acid with a dissociation constant of Ka: CA stands for acid concentration.
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Perform the following calculations:
1. What is the new volume of 500 mL of gas when the pressure changes from 750 torr to 980 torr? Assume a constant temperature.
2. A constant T, a 650 mL container of helium at 500 torr expands to 900 mL. What is the new pressure?
1. The new volume of 500 mL of gas is approximately 385 mL.
2. The new pressure is 345.45 torr.
The relationship between pressure, volume, and temperature of a gas is described by Boyle's law, which states that the volume of a gas is inversely proportional to its pressure, provided that the temperature remains constant. To find the new volume, we need to use the equation:
V1 * P1 = V2 * P2
Where V1 is the initial volume, P1 is the initial pressure, V2 is the final volume, and P2 is the final pressure. Substituting the given values, we get:
V2 = V1 * (P1 / P2) = 500 mL * (750 torr / 980 torr)
So, the new volume of 500 mL of gas is approximately 385 mL.
The relationship between pressure, volume, and temperature for a fixed number of gas particles can be described by the ideal gas law: PV = nRT, where P is the pressure, V is the volume, n is the number of particles, R is the gas constant, and T is the temperature (in Kelvin). In this problem, we are given the initial pressure, volume, and temperature, and asked to calculate the final pressure after the volume expands.
2. Since the number of particles (n) and temperature (T) are constant, we can rearrange the equation to find the final pressure after the volume expands:
P1V1 = P2V2
P2 = P1 * (V1/V2)
Plugging in the given values:
P2 = 500 torr * (650 mL / 900 mL) = 345.45 torr
So the new pressure of the helium is 345.45 torr.
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how do the results obtained for the metal samples compare with 3r (r here is the ideal gas constant)? comment on the differences of your values from 3r, and on any differences between aluminum and iron.
The container should be filled with several hundred particles. From the hold constant menu, pick temperature.
Following are the many R values: R is equal to 0.0821 liter•atm/molK. R is equal to 62.3637 lb/mol K or lb/mmHg/mol K. Atm, Torr, and mmHg are the different pressure units used here. Liters (L), Kelvin (K), and moles (mol) are the units for volume, temperature, and moles, respectively. When different pressures are applied and stated in various units, the value of R changes. offered here, Speed Vo, R - Distance from the Earth's centre. Force applied to the satellite, tangential speed, or vT. Gravitational force (Fg) is equal to centripetal force for satellites (Fc), Fc = Fo = Fg. GM = (v0)²R..................... (1) (1). Considering that satellite R = 3R.
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describe the following: the vapor in equilibrium with a pure liquid had the same composition as the liquid. is this statement also true for solutions?
Yes, this statement is also true for solutions. The vapor in equilibrium with a solution will have the same composition as the solution itself.
This is due to the fact that the vapor pressure of a solvent above a solution is equal to the vapor pressure of the pure solvent at the same temperature and pressure. This is known as Raoult's law, and it states that the vapor pressure of a solution is equal to the mole fraction of the solvent multiplied by the vapor pressure of the pure solvent
The statement that the vapor in equilibrium with a pure liquid has the same composition as the liquid is referring to the fact that the vapor pressure of a solvent above a solution is equal to the vapor pressure of the pure solvent at the same temperature and pressure (Raoult's law). This means that the composition of the vapor above a solution is the same as the composition of the solution itself. This is true for both pure liquids and solutions.
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(c) A new car produces 132 g of carbon dioxide per kilometre travelled.
Petrol contains mainly octane, C8H₁8. This is the equation for the complete combustion
of octane.
C8H18 +12.5 O₂8CO2 +9H₂0
Calculate the mass of octane that burns to produce 132 g of carbon dioxide.
[3]
132 gm of CO₂ is generated by combustion of 342 gm of C₈H₁₈.
What is Molecular Mass?The molar mass of a chemical compound is defined as the ratio between the mass and the amount of that substance in any sample. A material's molar mass is a bulk characteristic rather than a molecular one.
The molar mass of a substance is its mass expressed in grams per mole. G/mol, or grams per mole, is the sign for molar mass. The ratio between the mass of an isotope and the mass of the isotope carbon is known as the isotopic atomic mass, or mass of a single isotope of any particular element. -12
The reaction is :
C₈H₁₈ + 12.5O₂ ----> 8CO₂ + 9H₂O
Molar mass of C₈H₁₈ is = 12*8 + 18*1 = 114 gm
Molar mass of CO₂ is = 12+ 16*2 = 44gm
44gm of CO₂ is generated by 114 gm of C₈H₁₈
1 gm of CO₂ is generated by 114/44 gm of C₈H₁₈
132 gm of CO₂ is generated by combustion of 114*132/44 = 342 gm of C₈H₁₈
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name three groups that do not interfere with the oxidation of an alkyl side chain when attached to the benzene ring.
The three groups that do not interfere with the oxidation of the alkyl side chain when it is attached to the benzene ring are the halogen group , the ether group and the nitro group.
When the compound which contain an alkyl group that is directly attached to an aryl group and is treated with the strong oxidizing agent such as potassium permanganate (KMnO₄) or the Reagent ,H₂SO₄, the benzylic carbon will oxidized to the carboxylic acid group that remains attached to the aryl group. This is called as the oxidation of the side chain.
Thus, the halogen group , the ether group and the nitro group will not interfere with the oxidation of an alkyl side chain when attached to the benzene ring.
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A substance’s flashpoint is the temperature at which it will explode.a. trueb. false
It is false that a substance's flashpoint is the temperature at which it will explode.
The flash point is actually the lowest temperature at which ignition occurs, there will be enough flammable vapours to induce ignition when an ignition source is applied.
What is temperature?Temperature is the degree of hotness and coldness of a body.
What is ignition?Ignition is the process of setting fire from a fuel source.
What are flammable vapours?Flammable vapours are those which when mixed with air or oxygen in the right proportions are explosive.
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give the structure of the organic product expected when ch2i2 reacts with each of the alkenes in the presence of a zn–cu couple:
When ethyl magnesium bromide is treated with heavy water, the anticipated structure of the organic product is:
We are aware that heavy water is D 2 O because deuterium is a heavy form of hydrogen. An RMgX Grignard reagent is ethyl magnesium bromide. When the Grignard reagent is handled with water, or hydrolyzed, it produces matching alkanes and RMg(OH)X, where the hydrogen in the alkanes and the OH in the RMg(OH)X are derived from water, or H 2 O. The heavy hydrogen, D, is replaced by H in alkane when H 2 is replaced by D 2 O, and H is also replaced by D in RMg(OH)X.
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5. bromothymol blue was the indicator used in the experiment. why was the indicator necessary; in other words, what did it indicate? (3 pts)
Bromothymol blue was used to indicate the pH of the solution.
Bromothymol blue is a pH indicator, which means it changes color in response to changes in the pH of the solution. In particular, bromothymol blue is yellow in basic solutions (pH 7.6 - 6.0) and blue in acidic solutions (pH 6.0 - 7.6).
In the experiment, the presence of bromothymol blue allowed the researchers to observe changes in the pH of the solution, and to make more accurate measurements of the pH than would be possible without the indicator. This information was likely used to track the progress of the reaction or to monitor the pH of the solution at different stages of the experiment. By using bromothymol blue, the researchers were able to gain a better understanding of the conditions of the reaction and to make more informed conclusions about the results.
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The diameter of the nucleus is about 12 fm. A simple model of the nucleus is that protons and neutrons are confined within a one-dimensional box of length 12 fm.A) What is the first energy level, in MeV, for a proton in such a box?B) What is the second energy level, in MeV, for a proton in such a box?C) What is the third energy level, in MeV, for a proton in such a box?
A) The first energy level, in the MeV is
B) The second energy level, in the MeV is
C) The third energy level, in the MeV, is
The diameter of nucleus = 12 fm = 12 × 10⁻¹⁵ m
The length = 12 × 10⁻¹⁵ m
E = ( n² h² ) / 8 m l²
A) E₁ = (1)₂ ( 6.626 × 10⁻³⁴ J.s )² / 8 ( 1.672 × 10⁻²⁷ kg × )( 12 × 10⁻¹⁵ m)²
The first energy level, E₁ = 1.41 MeV
B) E₂ = ( 2)² ( 6.626 × 10⁻³⁴ J.s )² / 8 ( 1.672 × 10⁻²⁷ kg × )( 12 × 10⁻¹⁵ m)²
The second energy level = 5.68 MeV
C) E₃ = (3)² ( 6.626 × 10⁻³⁴ J.s )² / 8 ( 1.672 × 10⁻²⁷ kg × )( 12 × 10⁻¹⁵ m)²
The third energy level = 12.7 MeV
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2.48925 C : 3.9901 H : 1.000 0 The ratio does not give whole numbers, so we have to use a multiplier. What can we multiply each element by in order to have them all reach the smallest whole number?
multiply by
[ ? ]
Hint: The multiplier should be a whole number.
20,000 is the correct answer
What is empirical formula ?
The empirical formula of a chemical compound is the simplest ratio of the number of atoms of each element present in a compound. It represents the smallest whole number ratio of the elements in a compound and gives an indication of the relative proportions of the elements. The empirical formula is not necessarily the same as the molecular formula, which represents the actual number of atoms in a molecule. The molecular formula may be a multiple of the empirical formula and can be determined by analyzing the compound's molecular weight.
Multiply each by 20,000, then we have
C: 2.48925 x 20,000 = 49,785
H: 3.9901 x 20,000 = 79,802
O: 1.000 x 20,000 = 20,000
Multiply each element by in order to have them all reach the smallest whole number will be 20,000.
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Answer: The answer is 2
Explanation:
water is heated to 175 ∘f∘f . what is the temperature of the hot water in degrees celsius?
Answer:
°C÷5= (°F-32)÷9
Explanation:
Just apply the given formula above. Substitute 175 in place of °F then solve the equation
The temperature of 175 °Fahrenheit in degrees Celsius is 79.4 °Celsius.
What is temperature?Temperature is the degree to which a thing is hot or cold. Temperature is a measure of a system's average kinetic energy. As particles in a substance travel faster, their kinetic energy increases, raising the temperature of the system. Heat is defined as the energy exchanged when two bodies of differing temperatures come into contact. Temperature is a quantity that indicates a body's thermal condition (i.e., the degree of hotness or coldness of the body). When two bodies of differing temperatures come into touch, it defines the direction of heat transfer.
Here,
The temperature of hot water in degrees Celsius can be calculated by using the formula:
C = (F - 32) * (5/9)
where C is the temperature in degrees Celsius and F is the temperature in degrees Fahrenheit.
Plugging in the given temperature of 175 ∘F, we get:
C = (175 - 32) * (5/9)
C = 143 * (5/9)
C = 79.44∘C
So, the temperature of the hot water in degrees Celsius is approximately 79.44 ∘C.
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A gaseous mixture of methane , ethane and propane has partial pressures respectively of 95 kPa,105 kPa and 50 kPa. What is the mass percentage of methane in the mixture?
The mass percentage of methane in the gaseous mixture of methane, ethane, and propane is approximately 43.5%.
The mass percentage of a gas in a mixture can be calculated by dividing the mass of the gas by the total mass of the mixture and then multiplying by 100%.
To calculate the mass of each gas, the ideal gas law, PV = nRT, can be used. Here, P is the partial pressure of the gas, V is the volume of the mixture, n is the number of moles of the gas, R is the ideal gas constant, and T is the temperature.
Assuming a constant temperature and volume, the number of moles of each gas can be determined from the partial pressures of the gases:
n_methane = (95 kPa * V) / (R * T)
n_ethane = (105 kPa * V) / (R * T)
n_propane = (50 kPa * V) / (R * T)
The mass of each gas can be calculated using the molar mass of the gas:
m_methane = n_methane * M_methane
m_ethane = n_ethane * M_ethane
m_propane = n_propane * M_propane
Where M is the molar mass of the gas. The molar mass of methane is 16.04 g/mol, the molar mass of ethane is 30.07 g/mol, and the molar mass of propane is 44.10 g/mol.
The total mass of the mixture can be calculated as the sum of the masses of each gas:
total mass = m_methane + m_ethane + m_propane
Finally, the mass percentage of methane in the mixture can be calculated as:
mass percentage of methane = (m_methane / total mass) * 100%
Approximating the values, the mass percentage of methane in the gaseous mixture of methane, ethane, and propane is approximately 43.5%.
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which response provides the best explanation as to why ionic compounds easily dissociate in water? which response provides the best explanation as to why ionic compounds easily dissociate in water? nonpolar organic molecules such as fats and waxes dissolve well in water. the polarity of water allows it to easily dissociate most covalently bound compounds. the polarity of water easily breaks the charges between the oppositely charged ions in the compound. as a polar molecule, water cannot easily dissociate inorganic compounds.
Option (d) is correct. As a polar molecule, water cannot easily dissociate inorganic compounds.
Ionic compound is defined as a chemical compound composed of ions held together by electrostatic forces termed ionic bonding. The ionic compounds are neutral. It consists of positively charged ions called cations and negatively charged ions called anions. polarity is explained as a separation of electric charge leading to a molecule or its chemical groups having an electric dipole moment with a negatively charged end and a positively charged end. These polar molecules must contain one or more polar bonds due to a difference in electronegativity between the bonded atoms. water cannot easily dissociate inorganic compound due to polarity.
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The complete question is,
Which response provides the best explanation as to why ionic compounds easily dissociate in water?
(a) nonpolar organic molecules such as fats and waxes dissolve well in water.
(b) the polarity of water allows it to easily dissociate most covalently bound compounds.
(c) the polarity of water easily breaks the charges between the oppositely charged ions in the compound.
(d) as a polar molecule, water cannot easily dissociate inorganic compounds.
[see image and answer questions]
Based on the given solubility curve, the amount of solute dissolved in 100 mL of water at 30°C is 200 grams of solute.
What is a solubility curve?A graph of solubility (measured in g/100 g water) versus temperature (measured in °C) is known as a solubility curve. On the same graph, solubility curves for various substances are frequently depicted, allowing for easy comparisons.
The amount of solute dissolved in the saturated solution of the solute at 30°C is determined from the given solubility curve.
At 30°C, the solubility curve shows that 200 grams of solute are dissolved in 100 mL f water.
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what is the molar mass of kmno4? (mass has been rounded to 1 decimal place) k = 39.1 g mn = 55 g o = 16 g
The molar mass of KMNO₄ is 158.04 g mol-1.
Potassium permanganate is an inorganic compound having chemical formula KMnO₄. It is a purplish-black crystalline salt, which dissolves in water as K⁺ and MnO⁻
4, an intensely pink to purple solution.
Molar mass: The mass of the 1 mole of a substance is called as its molar mass.
Molar mass = Atomic mass of element × number of atoms given in subscript
Molar mass of potassium permanganate: Formula for potassium permanganate will be KMNO₄
Molar mass of KMNO₄ = Atomic mass of K + Atomic mass of Mn + (4 × Atomic mass of O)
= [ 39.10 g mol-1 + 54.94 g mol-1 + (4 × 16.00)g mol-1]
= 158.04 g mol-1
Hence, the molar mass of KMNO₄ is 158.04 g mol-1.
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augmentin 10mg/kg po every 12 hours is ordered. when augmentin is reconstiuted it yeilds 125mg/ml. the child weights 25kg. how many ml will you give
Answer:
To calculate the amount of Augmentin to give, you can use the following formula:
Dose (mg) = weight (kg) x dosage (mg/kg)
In this case, the dosage is 10mg/kg and the child's weight is 25kg, so:
Dose (mg) = 25 x 10 = 250mg
We know that the reconstituted Augmentin yields 125mg/ml, to find the amount in ml we divide the dose by the concentration:
250mg / 125mg/ml = 2 ml
So you will give 2ml of Augmentin to the child every 12 hours.
what is the molarity (molar concentration) of a solution made by dissolving 2.355 g of sulfuric acid (h2so4) in water and diluting to a final volume of 50.0
The molarity of the solution made by dissolving 2.355 g of sulfuric acid in water and diluting to a final volume of 50.0 mL is 0.957 M.
Sulfuric acid (H2SO4) has a molecular weight of 98.08 g/mol. To calculate the number of moles of sulfuric acid in the solution, we divide the mass of sulfuric acid (2.355 g) by its molecular weight (98.08 g/mol).
Next, we divide the number of moles of sulfuric acid by the volume of the solution in liters to obtain the molarity of the solution. The final volume of the solution is 50.0 mL, which we need to convert to liters by dividing by 1000.
The molarity (M) of the solution can be calculated using the following equation:
M = (number of moles of solute) / (volume of solution in liters)
Plugging in the values, we get:
M = (2.355 g / 98.08 g/mol) / (50.0 mL / 1000 mL/L) = 0.0478 mol / 0.05 L = 0.957 M
So, the molarity of the solution made by dissolving 2.355 g of sulfuric acid in water and diluting to a final volume of 50.0 mL is 0.957 M.
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how to convert ethene to acetylene...
Acetylene (C2H2) can be synthesized from ethene (C2H4) through a reaction called "partial oxidation". The reaction can be performed by passing ethene and air over a hot metal catalyst, typically made of copper or iron. The reaction is exothermic and generates heat, which helps to maintain the reaction temperature. The following is the equation for the conversion of ethene to acetylene:
C2H4 + O2 -> C2H2 + H2O
In this reaction, ethene reacts with oxygen from air to form acetylene and water. The reaction is usually performed in a controlled environment, such as a reactor, to ensure that the reaction conditions are suitable for optimal conversion of ethene to acetylene. The acetylene produced is then typically purified, compressed, and stored for later use as a fuel or chemical feedstock.
10.
Potash is a common name for potassium carbonate. Originally, potash was obtained by
adding water to the ash produced from the burning of wood, filtering and evaporating the
filtrate.
(a)
Meirion was asked to find the percentage of potash that could be obtained from some
wood ash. He added water to a known mass of wood ash, stirred the mixture and then
filtered the product. The filtrate was then made up to a volume of 250 cm³.
(i) State why the mixture was stirred.
[1]
E
(ii) Describe, giving full practical details, how the volume was made up to exactly
[4]
250 cm³.
Answer:
(a) (i) The mixture was stirred to ensure that the wood ash was completely mixed with the water, allowing for the maximum amount of potash to be dissolved and filtered out of the ash.
(ii) To make the volume up to exactly 250 cm³, Meirion can use a graduated cylinder or a measuring cylinder to measure the volume of the filtrate. He can then add distilled water to the filtrate until the total volume reaches 250 cm³. He can use a dropper or a pipette to add small amounts of water and stir the mixture until the desired volume is reached. He can also measure the volume with a graduated cylinder or a measuring cylinder. Finally, he can check the final volume of the solution again to make sure that the volume is exactly 250 cm³.
1. A calorimeter holds 105 g water at 21.0°C. A sample of hot iron is added to the water, and
the final temperature of the water and iron is 28.0°C. What is the change in enthalpy 2 Cheat
associated with the change in the water's temperature? The specific heat of water is 4.18
J/(g. °C).
Elthalpy change is the heat absorbed by water for the iron placed in water is 3072.3 Joules.
What is Enthalpy ?A thermodynamic system's enthalpy, which is one of its properties, is calculated by adding the system's internal energy to the product of its pressure and volume. It is a state function that is frequently employed in measurements of chemical, biological, and physical systems under constant pressure, which the large surrounding environment readily provides.
The amount of heat released or absorbed during a reaction that takes place under constant pressure is referred to as the enthalpy change. It has the sign H, which may be interpreted as "delta H."
The initial tempareture of the water is 21°C
Final temperature of the water is 28°C
Change in temperature is 28 - 21 = 7°C
Elthalpy change is the heat absorbed by water for the iron placed in water is 4.18*105*7 = 3072.3 Joules.
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what body processes are affected by altered cellular and tissue adaptation?
Altered cellular and tissue adaptation can impact various bodily processes. Altered cellular and tissue adaptation affects multiple bodily processes such as cellular metabolism, growth, repair, and cellular signaling pathways.
Cellular metabolism involves the transfer of energy and the conversion of nutrients into energy and waste products. When cellular adaptation is altered, it can impact the metabolic processes and the balance of energy.
Growth and repair processes are crucial for maintaining the health and functioning of tissues. These processes are regulated by hormones, growth factors, and signaling pathways that are influenced by cellular adaptation. Altered cellular adaptation can disrupt these processes and lead to cellular dysfunction, tissue damage, and pathological conditions such as cancer.
Cellular signaling pathways are critical for the communication and coordination of cells and tissues. They regulate various physiological processes such as cell division, cell migration, and gene expression. Altered cellular adaptation can disrupt signaling pathways and cause cellular dysfunction and disease.
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SOMEONE PLSSSSSSSSSSSSSSSS HELP ME ASAP
photoplankton play an important role in the carbon cycle because
A- photosynthesis by phytoplankton removes carbon from the atmosphere
B- They convert carbon dioxide to methane
C- They eat animals that have stored carbon
The majority of the transfer of carbon dioxide from the atmosphere to the ocean is carried out by phytoplankton.
What is the purpose of phytoplankton?Microscopically small plants called phytoplankton are important components of the marine food chain. Similar to plants on land, phytoplankton use photosynthesis to transform sunlight into energy for survival. They also take in carbon dioxide and release oxygen.The oceanic biological pump removes more carbon dioxide from the atmosphere when there are large phytoplankton blooms, which has a significant impact on climate in two ways. In addition, removing greenhouse gas molecules from the atmosphere reduces the warming impact of CO2 emissions from fossil fuels.The plants (phytoplankton, kelp, and algal plankton) that inhabit the ocean produce oxygen. The process of photosynthesis, which turns carbon dioxide and sunlight into sugars an organism may use for energy, results in the production of oxygen by these plants.To learn more about phytoplankton refer to:
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which of the following molecules are polar? Why? ch4, ch3br, ch2br2, cbr4
Out of the given molecules it is CH4 (methane) which is non- polar molecule rest all them i.e. CH3Br,CH2Br, CBr4 are polar molecules.
Methane has four single covalent carbon–hydrogen bonds. Because there is no charge separation as a result of the equal distribution of electrons, these covalent bonds are known as nonpolar covalent bonds (dipole moment).
Because the electronegativity of the Br is higher than that of the C and H, the C-Br bonds in CH3Br are more polar than the C-H bonds. Despite the bonds being arranged symmetrically around the carbon atom, the molecule is polar because of the lower polarity of the C-H bond, which prevents the bond dipoles from cancelling.
The net dipole on the Br side of the polar molecule is created by the presence of two dipoles on the same side of the molecule (Br). The four polarities that make up the NOT polar molecule are distributed evenly and cancel one another out.
Molecules have a net dipole moment when they are polar. Due to the atoms cancelling each other out, CBr4 has a dipole moment of 0. The geometry of the atoms' chemical bonds must be taken into account in order to calculate the dipole moment. Whether there is a net dipole moment depends on where each molecule is positioned. The CBr4 molecule's tetrahedral shape, which places a carbon atom in the centre and four bromine atoms on either side, cancels out the net charges of the bromine molecules.
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