What do you mean by molarity?
Molarity-Molarity is a term that is used to show concentration of the solution . It is different from molality as it is expressed in mol per L , whereas molality is expressed in mol per kg.
Given:
Mass of Mgs is 25.7 g.Volume of the solution is 919 ml.The mole of Mgs is calculated as follows :
Mole= Mass / Molar Mass
= 25.7g/56.38 g/mol
= 0.455 mol.
The molarity of Mgs solution is calculated as follows :-
Molarity =Mole/Volume ( L )
=0.455mol/919ml* 1000ml/1L
=0.495M
Thus, the molarity of the solution is 0.495 M.
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How much heat is required to melt 39.4 g of ice at (0 ∘C )? The heat of fusion for water is 6.02 kJ/mol .
Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, 13.12KJ of heat is required to melt 39.4 g of ice at (0 ∘C ).
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.
Mathematically,
q = n ×ΔH
where
q = amount of heat= ?
n = no of moles
ΔH = enthalpy ( 6.02 kJ/ mol)
n = w / M.M
w = given mass =39.4g
M.M = molar mass ( molar mass of water)=18g/mol
n =39.4/ 18
=2.18
Substituting all the given values, we get
q = n ×ΔH
= 2.18 ×6.02
= 12.401 kJ
=13.12KJ
Therefore, 13.12KJ of heat is required to melt 39.4 g of ice at (0 ∘C ).
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A 1.20 L weather balloon on the ground has a temperature of 25.0°C and is at atmospheric pressure (1.00 atm). When it rises to an elevation where the pressure is 0.730 atm, then the new volume is 1.80 L. What is the temperature (in °C) of the air at this elevation?
The final temperature (°C) of the air at this elevation is 326.3K.
How to calculate temperature?The temperature of a gas can be calculated using the combined gas law equation as follows:
P₁V₁/T₁ = P₂V₂/T₂
Where;
P₁ = initial pressureV₁ = initial volumeT₁ = initial temperature P₂ = final pressureV₂ = final volumeT₂ = final temperatureAccording to this question, 1.20L weather balloon on the ground has a temperature of 25.0°C and is at atmospheric pressure (1.00 atm). When it rises to an elevation where the pressure is 0.730 atm, then the new volume is 1.80L. The final temperature can be calculated thus:
1 × 1.2/298 = 0.730 × 1.8/T₂
0.004027T = 1.314
T = 326.3K
Therefore, 326.3K is the final temperature of the balloon.
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) Classify each material below as a Strong Electrolyte, Weak Electrolyte, or Non-Electrolyte
Al(OH)3 , HN3 , C8H10 , HC3H5O2
Al(OH)3 = weak electrolyte
HN3 = strong electrolyte
C8H10 = Non electrolyte
HC3H5O2 = weak electrolytes.
What are electrolytes?
An electrolyte is described as a medium containing ions that is electrically conducting through the movement of those ions, but not conducting electrons. Electrolytes includes most soluble salts, acids, and bases dissolved in a polar solvent, such as water.
The human cells use electrolytes to conduct electrical charges, which is how your muscles contract. Those same electrical charges gotten from also help with chemical reactions, especially when it comes to hydration and the balance of fluids inside and outside of cells.
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If a gas that has a pressure of 15 atm, a volume of 28 liters, and a
temperature of 400 K, has an increased pressure to 18 atm and increase
the temperature to 500 K, what is the new volume of the gas?
о 8,571 L
о 29.17 L
525 L
18.9 L
*
2 points
To calculate the new volume of a gas, we must first understand the atm.
What is atm?
oceanic atmospheric pressure At sea level, it has a mean value of about and is defined as the pressure created by the weight of the atmosphere. Sometimes, this figure is used as a standard pressure or a reference pressure. The unit of pressure is atm.
What does one atmosphere of pressure equal?
760 cm of mercury is equal to one atmosphere of pressure at sea level.
Using the atm formula,
P1 V1/T1 = P2 V2/T2
15×28/500= 18×V2/500
15×28×400/500×18 = V2
V2=29.166
V2=29.17 L
Therefore the option (B) is correct.
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If 2.186×10-2 mol of NH3 gas has a volume of 365 mL at 32°C, what would be the volume of 2.186×10-2 mol of N2 gas under identical temperature and pressure conditions?
The volume of the 2.186×10⁻² mole of N₂ gas under identical temperature and pressure conditions will also be 365 mL
How do I determine the volume of N₂?We'll begin by obtaining the pressure of NH₃. This can be obtained by using the ideal gas equation as illustrated below:
Mole of NH₃ (n) = 2.186×10⁻² moleVolume (V) = 365 ml = 365 / 1000 = 0.365 L Temperature (T) = 32 °C = 32 + 273 = 305 KGas constant (R) = 0.0821 atm.L/Kmol Pressure (P) = ?PV = nRT
Divide both sides by V
P = nRT / V
P = (2.186×10⁻² × 0.0821 × 305) / 0.365
P = 1.5 atm
Finally, we shall determine the volume of the N₂ under identical (i.e the same) temperature and pressure conditions. This is illustrated below:
Mole of N₂ (n) = 2.186×10⁻² moleTemperature (T) = 32 °C = 32 + 273 = 305 KPressure (P) = 1.5 atm Gas constant (R) = 0.0821 atm.L/Kmol Volume (V) = ?PV = nRT
Divide both sides by P
V = nRT / P
V = (2.186×10⁻² × 0.0821 × 305) / 1.5
V = 0.365 L
Multiply by 1000 to express in liters
V = 0.365 × 1000
V = 365 mL
Thus, the volume is 365 mL
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Have two sides that mirror each other along one plane through the central axis.
Have two sides that mirror each other along one plane through the central axis called as symmetrical
The line of centroids or central axis is defined as the line that passes through the centroids along the beam and the cross section are then defined as the beam section which are perpendicular to the central axis and that two side are mirror images of each other and place a mirror on the fold then image of one side of the picture will fall exactly on the other side of the picture and that are called as symmetrical means same
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How many electronic under layers are there on level n=7?
The seventh shell contains 49 orbitals, making the total number of electrons in 49 orbitals 98.
How do Group 7 elements appear?characteristics of elements in group 7
At room temperature, each halogen exhibits the properties listed below: A light yellow gas is fluorine. A deadly green gas, chlorine is poisonous. The reddish-brown liquid bromine is poisonous.
Since the group number is 7, this means that the outer shell of halogen atoms contains seven electrons (energy level). These atoms gain a single electron in order to stabilize themselves and adopt the same structure as the nearby noble gas (rather than losing seven electrons which would take much more energy).
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Commercial concentrated nitric acid, HNO3, is 15.8 M. What volume of concentrated HNO3 would be required to prepare 842 mL of 7.77 M HNO3?
The volume of the concentrated HNO₃ that would be required to prepare 842 mL of 7.77 M HNO₃ is 414 mL
How do I determine the volume concentrated HNO₃ required?We can obtain the volume of the concentrated HNO₃ required to prepare 842 mL of 7.77 M HNO₃ by using the dilution formula as shown below:
Molarity of concentrated HNO₃ (M₁) = 15.8 MVolume of diluted solution (V₂) = 842 mL Molarity of diluted solution (M₂) = 7.77 MVolume of concentrated HNO₃ (V₁) =?M₁V₁ = M₂V₂
15.8 × V₁ = 7.77 × 842
15.8 × V₁ = 6542.34
Divide both side by 15.8
V₁ = 6542.34 / 15.8
V₁ = 414 mL
Thus, the volume of concentrated HNO₃ required is 414 mL
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What is the physical state of strontium at 25 degrees?
Answer:
Strontium is a chemical element with symbol Sr and atomic number 38. Classified as an alkaline earth metal, Strontium is a solid at room temperature.
Explanation:
What is a negative control?
A- Group that gives a result that disproves your hypothesis
B- Group in which no response is expected
C- Group that gives an unexpected result
D- Group in which a response is expected
According to the given information Group in which no response is expected is a negative control.
The correct option is C.
What is an example of a hypothesis ?A scientist may develop the hypothesis that a given type of tomato will be red if it carries the gene for the colour red. The scientist then discovers that every tomato of this variety is red during investigation.
What is the purpose of an hypothesis?Hypotheses are frequently employed to promote scientific research and enhance knowledge. These clear declarations serve as the cornerstone for all research experiments. Therefore, a problem in the creation of a hypothesis may lead to errors in the design of a whole experiment.
What is the main function of hypothesis?As previously said, a hypothesis serves as a response to the research question and directs the gathering and analysis of data. Researchers can use hypotheses to both identify relationships between variables and forecast relationships based on theoretical principles and/or empirical data.
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Fe(s) + 2 HNO3(aq) →Fe(NO3)2(aq) + H₂(g)
What is the total number of oxygen atoms represented in the formula of the iron
compound produced?
Answer: 6
Explanation:
If we are only looking at the number of oxygen atoms in the product then the answer is 6.
NO3 contains 3 oxygen atoms.
(NO3)2 means that we have 2 NO3 groups which means there are 6 oxygen atoms.
A chemist needs 16.61 mL of 1.312 M NaOH. What volume in mL of 3.6 M NaOH must be diluted in water to form this solution?
Please report your answer in mL to 3 decimal places.
A chemist must take 6.053 mL of 3.6 M NaOH in water to form 16.61 mL of 1.312 M NaOH solution.
In the laboratory, high-concentration solutions are prepared for using a longer duration. This solution is known as a stock solution. These solutions are diluted based on chemical needs. We need 6.61 mL of 1.312 M NaOH solution The stock concentration of NaOH solution = 3.6 M We have to find the volume of this stock solution that should be taken Given M₁ = 3.6 M M₂ = 1.312 M V₂ = 16.61 mL V₁ =?
M₁V₁ =M₂V₂
3.6 × V₁ = 1.312 × 16.61
V₁ = 1.312 × 16.61 ÷ 3.6
V₁ = 6.053 mL
Hence, 6.053 mL of 3.6 M NaOH is needed to form 16.61 mL of 1.312 M NaOH solution
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Calculate the volume (mL) of a 2.50M NaOH solution are required to make 725 mL of a 0.150M NaOH solution?
The volume of a 2.50M NaOH solution required to make 725 mL of a 0.150M NaOH solution is 43.5mL.
How to calculate volume of a solution?The volume of a solution can be calculated using the following expression:
CaVa = CbVb
Where;
Ca = initial concentrationCb = final concentrationVa = initial volumeVb = final volumeMolarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.
According to this question, 2.50M NaOH solution are required to make 725 mL of a 0.150M NaOH solution. The volume required can be calculated as follows:
2.5 × Va = 725 × 0.150
2.5Va = 108.75
Va = 43.5mL
Therefore, 43.5mL is the volume of the solution.
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18.00 g hydrated magnesium
sulfate is heated to drive off the
water, leaving 9.211 g MgSO4 solid.
What is the formula of the hydrate?
The formula of the hydrate would be [tex]MgSO_4.6H_2O[/tex].
Deducing the formula of a hydrate saltIn order to get the formula of the hydrated salt, the empirical formula method can be used to know the mole of the salt and that of the water.
The formula of magnesium sulfate = [tex]MgSO_4[/tex]
The formula of water = [tex]H_2O[/tex]
Mass of hydrated magnesium sulfate = 18.00 g
Mass of anhydrous magnesium salt = 9.211g
Mass of water = 18 - 9.211
= 8.789 g
Now, let's find the mole equivalent of each component:
Molar mass of magnesium sulfate = 120.366 a/mol
Molar mass of water = 18.01 g/mol
Mole of magnesium sulfate anhydrous = 9.211/120.366
= 0.0765 mole
Mole of water = 8.789/18.01
= 0.4880 mole
Now, let's divide by the lowest mole:
Magnesium sulfate = 0.0765/0.0765
= 1
Water = 0.4880/0.0765
= 6.37
Thus, the mole ratio of magnesium sulfate and water of hydrate is 6 to 1. Therefore, the formula of the hydrated salt would be [tex]MgSO_4.6H_2O[/tex].
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How much NaOH (in moles) must be added to 1 L of a buffer solution that is 1.8 M in acetic acid and 1.2 M in sodium acetate to result in a buffer solution of ph 5.22? Assume volume to remain constant.
Hydrogenation of cholesterol
The molecular structure of the fat is changed when lipids like cholesterol are exposed to hydrogenation.
What is cholesterol?
Any member of the lipids class of specific chemical compounds is a kind of cholesterol. It is a sterol, a class of lipid (or modified steroid). All animal cells produce cholesterol, which is a crucial part of the membranes that make up those cells. It is a yellowish crystalline solid when chemically separated. It is possible to increase the saturation of fatty acids by adding hydrogen to unsaturated fatty acid chains, which connects the hydrogen atoms to the saturation sites.
Hence, the molecular structure of the fat is changed when lipids like cholesterol are exposed to hydrogenation.
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the substance that speed up the digestion stop working when they have been boiled, what does asim need to put in a fourth test tube to test this in his experiment?
please help me guys i need this like rn
It is expedient that Asim put some few pancreatic blood in a test tube to test for the functioning of digestive enzymes produced by the pancreas.
What is the purpose of the Asim experiment for digestive enzyme?When someone is considering the purpose of digestive enzyme experiments, it should be what is given below:
Objectives:
To identify the substrates and enzymes,Also to the reasons while the substance which speeds up digestion stopped.That being said, enzymes are organic, biological or biochemical catalysts which speed up the rate of chemical reactions. Within the context of the task given above, digestive enzymes help to speed up the digestion of food substances. In order to confirm why this substance stopped working, a pancreatic blood test needs to be done in a test tube to confirm the reasons why the substance stopped working.
However, some of the reasons why digestive enzymes stopped working include the following:
Concentration of the substancepH of the substance Temperature of the substanceSo therefore, screening for pH, concentration and temperature of the digestive enzyme can used to test for inactivity of enzymes.
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How many joules are in 6,458 Cal? Express your answer in scientific notation with the correct number of significant figures.
The number of Joules in 6,458 Calories calculated to the correct number of significant figures would be 2.6790 x [tex]10^4[/tex] Joules.
Unit conversionBoth Joules (J) and Calories (Cal) are units of energy. According to the standard unit of conversion:
1 kiloCalorie = 4148 Joules
Since, 1 kiloCalorie = 1000 Calorie
Then:
1000 Calorie = 4148 Joules
Thus;
1 Calorie = 4148/1000
= 4.148 Joules
Now, let's see the number of Joules that is equivalent to 6,458 Calories.
1 Calorie = 4.148 Joules
6,458 Calories = 4.148 x 6,458
= 26787.784 Joules
According to one of the rules guiding significant figures when performing multiplication operations, the number with the lowest significant figure is considered for the significant figures of the final answer.
Thus, the final answer, in this case, would be to four significant figures.
In other words, 6,458 Calories = 2.6790 x [tex]10^4[/tex] Joules.
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Explain the reaction between iodine solution and polysaccharides by giving the structures of related Compounds.
The explanation of the reaction between the compounds is here.
What is compound?
A thing that is composed of two or more separate elements is called compound.
Sol-There is no chemical reaction. Know the extent between to react to react and fair play mixing I too means iodine and potassium I Od um ordered solution solution and I could not React directly as such bad form poorly I owed eight iron like I five and I seven. They negatively charged iodide in the negatively charged how you died. All right, come and did come about charge donor. The neutral iodine charging accepted a solution of iodine, a solution of iodine and potassium iodide um added in water had the light orange brown color, light orange brown color, orange brown color. Once a mileage is added it from another city complex. When once a mileage in my load I added it from another city complex.
When once a mileage in my load I added it from another city complezx.. The police have cried. The police had cried, the police have cried act as a George donor charges and the police have died. And the poly iodide act as a except her. The new council looks absorbing light of a different wavelength than polly iodide and the color turn dark dark blue. The object structure are poorly added inside the am I late helix Alex is not clear. Are bulky and sit inside the policy crowds of glucose units and could not get out of date.
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Calculate the molar solubility of iron(II) hydroxide, Fe(OH)2, in a solution buffered at a pH of
13.15. The Ksp of Fe(OH)2 is 1.6 × 10−14.
The solubility of solute in a solution can be find out from the solubility constant Ksp and molar concentrations. The solubility of iron hydroxide in the solution is 3.19 ×10 ⁻¹⁶ M.
What is solubility?Solubility of substance is the fraction of its concentration which dissolves in a solvent at a specific temperature. The solubility constant Ksp is the product of molar concentrations of the ions in the solute.
It is given that the pH of the solution is 13.15. Thus, pOH = 14 -13.15 = 0.85.
[OH-] = Antilog (pOH) = antilog (0.85)
= 7.07 M.
The solute Fe(OH)₂ dissociates into Fe²⁺ ion and 2 OH- ions. Let s be the solubility of one mole of ion. Thus [Fe²⁺] = s. Then, the Ksp can be written as follows:
Ksp = [Fe²⁺] [OH-]²
1.6 × 10⁻¹⁴ = s × [7.07 M]²
s = 1.6 × 10⁻¹⁴/[7.07 M]²
= 3.19 ×10 ⁻¹⁶ M.
Therefore, the molar solubility of iron(II) hydroxide in the given solution is 3.19 ×10 ⁻¹⁶ M.
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If we use 25.05 mL of the solution above to reach the endpoint titrating 10.00 mL of a 0.200 M HCl solution, what is the working (actual) concentration of the NaOH solution? Remember, you need a balanced chemical reaction for stoichiometry. (do not forget about SF)
The concentration of the solution is obtained as 0.08 M.
What is the concentration of sodium hydroxide?We know that the reaction that occurs between the sodium hydroxide and the hydrochloric acid is one that may be referred to as neutralization reaction. We can see that the reaction is given by; [tex]NaOH(aq) + HCl(aq) --- > NaCl(aq) +H_{2} O(l)[/tex]
Thus;
Concentration of the acid CA = 0.200 M
Volume of the acid VA = 10.00 mL
Volume of the base VB = 25.05 mL
Concentration of the base CB = ??
Number of moles of the acid NA = 1
Number of moles of the base NB = 1
Then;
CAVA/CBVB = NA/NB
CAVANB = CBVBNA
CB= CAVANB/VBNA
CB = 0.200 M * 10.00 mL * 1/ 25.05 mL * 1
= 0.08 M
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the nuclear equation of the neutron bombardment of cobalt-60
The nuclear equation for this reaction shows the gamma rays that are released when cobalt-60 is produced. 5927Co+10n⟶6027Co+γ
What is nuclear reaction ?
In nuclear physics and chemistry, a nuclear reaction is the process by which two atomic nuclei or nuclei and external particles collide to produce one or more new nuclides. Therefore, a nuclear reaction must transform at least one nuclide into another nuclide. When a nucleus interacts with another nucleus or particle and they separate without changing the properties of the nuclide, this process is simply called a form of nuclear scattering and is not a nuclear reaction.
Although in principle two or more particles could react and collide, the probability of three or more nuclei colliding in the same place at the same time is much lower than for two nuclei, so such Incidents are very rare.
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Imagine you are sitting in a room with a volume of 23000 liters and a temperature of 69 degrees F. The total air pressure is 766 mm Hg, and the partial pressure from oxygen is 21% of the total pressure. How many grams of oxygen are in the room?
The mass (in grams) of oxygen gas in the sitting room of 23000 liters is 6412.16 grams
How do I determine the mass of oxygen gas?We'll begin by converting 69 °F to °C. This can be obtained as follow:
Temperature (°F) = 69 °FTemperature (°C) =?°C = 5/9(°F - 32)
°C = 5/9(69 - 32)
°C = 20.6 °C
Next, we shall determine the mole of oxygen gas in the room. This is shown below:
Volume (V) = 23000 L Temperature (T) = 20.6 °C = 20.6 + 273 = 293.6 KTotal pressure = 766 mmHg = 766 / 760 = 1 atmPercentage of oxygen = 21%Presure of oxygen (P) = 21% × 1 = 0.21 atmGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) =?PV = nRT
0.21 × 23000 = n × 0.0821 × 293.6
Divide both sides by (0.0821 × 293.6)
n = (0.21 × 23000) / (0.0821 × 293.6)
n = 200.38 moles
Finally, we shall determine the mass of oxygen gas in the room
Mole of oxygen gas = 200.38 moles Molar mass of oxygen gas = 32 g/molMass of oxygen gas =?Mole = mass / molar mass
Cross multiply
Mass = Mole × molar mass
Mass of oxygen gas = 200.38 × 32
Mass of oxygen gas = 6412.16 grams
Thus, the mass of oxygen gas is 6412.16 grams
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Calculate Gibbs energy for the following condition K = 1.7 x 10^2, T = 25 c
The Gibbs free energy of the system is - 12.7 kJ/mol.
What is the Gibbs free energy?The term Gibbs free energy has to do with the amount of thermodynamic work that could be done by a system. We know that we can find the Gibbs free energy by the use of the equilibrium constant and the temperature of the system and that is what we have to do in this question as we do it.
We know that;
ΔG = -RTlnK
ΔG = The Gibbs free energy
R = gas constant
T = temperature
K = equilibrium constant
Thus;
R = 8.314 J/K/Mol
T = 25°C + 273 = 298 K
K = 1.7 x 10^2
When we substitute the values, we have;
ΔG =-(8.314 * 298 * ln 1.7 x 10^2)
ΔG =- 12.7 kJ/mol
We can see from the calculation that we are going to have the Gibbs free energy of the system thus described as - 12.7 kJ/mol.
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According to the collision theory of reaction rates, which of the following are true? Choose all that apply. Raising the temperature would increase the rate of the reverse reaction by increasing the number of successful 2 O2 collisions. Increasing the concentrations of O3 + O would increase the rate of the forward reaction. At a higher temperature, the rate of the reverse reaction will increase because the value of ΔE will be smaller than -392 kJ. Increasing the concentration of O3 + O would have no effect on the rate of the forward reaction. In the presence of a catalyst, the value of ΔE will be smaller than -392 kJ.
The given reaction is an exothermic reaction thus, heat is evolved in the reaction. Thus increasing temperature increases the rate of reverse or backward reaction. Increasing concentration of ozone and O will increase the rate of forward reaction.
What is collision theory?According to collision theory, the rate of a reaction depends on the number of effective collisions of the reactants. The given reaction is the combination of ozone with oxygen to give oxygen molecule.
This reaction is exothermic, hence increasing the temperature will effect the equilibrium so as to consume the extra temperature reverse reaction will take place by which collision of O₂ molecules increases.
Similarly increasing the concentration of reactants O₃ and O will increase the rate of forward reaction. The enthalpy change is negative here indicating the reaction is exothermic, thus, increase the temperature and use of catalyst also decreases the activation energy ΔE.
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It's 100 degrees outside today. You forgot your nearly full water bottle in the car when you went into the store. When you return later, you open the water bottle and it makes a "hissing" sound. Explain why this occurs. In your response, discuss what is happening with the water molecules and how thermal energy is changing.
The hissing sound from the water bottle occurred due to increase in thermal energy of the car which is the immediate environment of the water bottle.
What is thermal energy?Thermal energy is defined as the type of energy that expresses the flow of heat through a medium.
When there is increase in heat energy, outside the an enclosed medium such as a car, all the contents within the medium also increases in temperature.
There is also a rise in temperature of water in the water bottle and this causes the water molecules to gain energy, vibrate and collide more often among each other.
The hissing sound occurs due to a rise in pressure of the water occuring due to rise in temperature.
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What is one way the concept of stability is seen in chemistry?
Stability can be seen in chemistry through thermodynamics or kinetic stability.
There are two possible meanings of stability when it refers to coordination compounds (metal complexes): kinetic stability or thermodynamic stability.
The change in energy when reactants become products or G for the reaction is referred to as thermodynamic stability. Reactivity, or generally ligand substitution, is referred to as kinetic stability. In some situations, substitution happens relatively quickly, while in others, it happens quite slowly. Complexes of the first type are known as labile, whereas those of the second type are known as inert. These two forms of stability can sometimes be parallel to one another, but they are frequently not.The energetics and associated equilibrium constant for the reaction of an aquated metal ion with another ligand is frequently referred to as the reaction's "thermodynamic stability" (other than water). The stability constant () is equal to the instability constant reciprocated.Learn more about thermodynamic stability here:
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Oxygen gas reacts with powdered aluminum according to the following reaction:
4Al(s)+3O2(g)→2Al2O3(s)
What volume of O2 gas (in L), measured at 792 mmHg and 23 ∘C, is required to completely react with 52.6 g of Al?
The volume (in L) of O₂ gas, measured at 792 mmHg and 23 °C, that is required to completely react with 52.6 g of Al is 34.14 L
How to determine the volume of O₂We'll begin by obtaining the mole of O₂ that reacted. This can be obtained as follow:
Mass of Al = 52.6 gMolar mass of Al = 27 g/molMole of Al = mass / molar mass = 52.6 / 27 = 1.948 mole4Al(s) + 3O₂(g) → 2Al₂O₃(s)
From the balanced equation above,
4 moles of Al reacted with 3 moles of O₂
Therefore,
1.948 moles of Al will react with = (1.948 × 3) / 4 = 1.461 mole
Finally, we shall determine the volume of the O₂ required. Details below
Mole of O₂ (n) = 1.461 moles Pressure (P) = 792 mmHg = 792 / 760 = 1.042 atm Temperature (T) = 23 °C = 23 + 273 = 296 KGas constant (R) = 0.0821 atm.L/Kmol Volume (V) =?PV = nRT
1.042 × V = 1.461 × 0.0821 × 296
Divide both sides by 1.04
V = (1.461 × 0.0821 × 296) / 1.04
V = 34.14 L
Thus, the volume required is 34.14 L
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How many molecules are in 12.80 moles of strontium bydroxide?
77.094*[tex]10^{23}[/tex] molecules are in 12.80 moles of strontium bydroxide.
What does Sr OH 2's formula go by?The chemical strontium hydroxide has a molecular weight of 121.6324 g/mol and the molecular formula Sr(OH)2. It appears in the form of an anhydrate with prismatic, colorless crystals that are liquescent.
What fraction of atoms and molecules makes up NaOH?The building By counting the number of components (and their corresponding quantities) listed in the chemical formula, one can easily determine that each molecule of the compound NaOH contains three atoms.
By mole concept-
1moleof strontium bydroxide =6.023*[tex]10^{23}[/tex] molecules of strontium bydroxide.
so,
12.80 moles of strontium bydroxide =12.80*6.023*[tex]10^{23}[/tex]
No of molecule =77.094*[tex]10^{23}[/tex] molecule
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A sample of gas is placed in a 25.0 L sealed container at STP. The
container is heated to 25 C. What will be the pressure in the container?
The pressure of a sample of gas placed in a 25.0L container at STP is 0.98atm.
How to calculate pressure?The pressure of an ideal gas can be calculated by using the following formula:
PV = nRT
Where;
P = pressureV = volume n = number of molesT = temperatureR = gas law constantAccording to this question, a sample of gas is placed in a 25.0 L sealed container at STP. The container is heated to 25°C. The pressure in the container is as follows:
P × 25 = 1 × 0.0821 × 298
25P = 24.47
P = 0.98atm
Therefore, 0.98atm is the pressure of the gas
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