Question 1

What is the mole fraction of O2 in a gas mixture with a total pressure of 750 torr when the partial pressure of O2 is 125 torr?

Accepted Answer

A)  0.167
B)  6.00
C)  0.200
D)  0.333
E)  0.833F) C) and D)
G) D) and E)

Question 2

N2O (laughing gas)  is used as an anesthetic.A dentist has a 2.00 L flask of N2O at a pressure of 1.00 atm and a 3.00 L flask of nitrogen gas at 2.00 atm that are separated by a valve.What is the final pressure in the flasks when the valve is opened and the gases mix together? Both flasks are at the same temperature, and the temperature does not change when the gases mix.

Accepted Answer

A)  3.00 atm
B)  1.50 atm
C)  1.60 atm
D)  1.20 atm
E)  1.00 atmF) A) and C)
G) A) and B)

Question 3

What volume is occupied by 1.00 mol of an ideal gas at 1.00 atm and 0.00  °\degree° C?

Accepted Answer

A)  22.4 L
B)  22.7 L
C)  22.1 L
D)  15.0 L
E)  27.2 L F) B) and E)
G) A) and B)

Question 4

In an experiment, 8.65 grams of SF6 gas are placed in a container at 27.5 $\degree$C and 1.30 atm.What is the density of the gas?

Accepted Answer

7.70 g/L

Question 5

Which of the following statements about the properties of gases is NOT correct?

Accepted Answer

A)  At low temperatures, the attractive forces between molecules cause a real gas to deviate from ideal gas behavior, and the van der Waals a factor adjusts for this.
B)  At high pressures, the finite size of the molecules causes a real gas to deviate from ideal gas behavior, and the van der Waals b factor adjusts for this.
C)  The ratio PV/RT = 1 for one mole of an ideal gas.
D)  The ratio PV/nRT = 1 because of repulsive interactions between the molecules.
E)  The ratio PV/nRT   >\gt> 1 because of the finite size of the molecules. F) A) and B)
G) B) and E)

Question 6

Assuming all of these samples of gas are at the same temperature, which will escape through a hole in a balloon at the lowest rate?

Accepted Answer

A)  20 moles of H2 in a 12 L balloon
B)  3 moles of Xe in an 18 L balloon
C)  8 moles of Ne in a 24 L balloon
D)  4 moles of Cl2 in a 16 L balloon
E)  12 moles of He in a 24 L balloonF) None of the above
G) A) and B)

Question 7

How many moles of propane are contained in a 5.00 L tank at 450 torr and 25  °\degree° C?

Accepted Answer

A)  0.12 mol
B)  92 mol
C)  1.4 mol
D)  1100 mol
E)  41 mol F) B) and E)
G) A) and B)

Question 8

Calculate the average kinetic energy of CO2 molecules with a root-mean-square speed of 629 m/s.Report your answer in kJ/mol.The mass of one CO2 molecule is 7.31 * 10-26 kg. (1 J = 1 kg . m2/s2; 1 mol =6.02 * 1023)

Accepted Answer

A)  8700 kJ/mol
B)  14 kJ/mol
C)  17 kJ/mol
D)  8.7 kJ/mol
E)  28 kJ/molF) A) and E)
G) None of the above

Question 9

At a given temperature, oxygen gas effuses 1.489 times faster than which of the following gases?

Accepted Answer

A)  CO2
B)  SO2
C)  Kr
D)  Xe
E)  Cl2F) A) and B)
G) A) and C)

Question 10

Which of the following statements regarding the kinetic molecular theory of gases is NOT correct?

Accepted Answer

A)  The gas particles are assumed to occupy negligible volume.
B)  At a given temperature, the gas particles have the same velocity.
C)  The gas particles are in constant, rapid, random motion.
D)  The average kinetic energy of the gas particles is directly proportional to the absolute temperature.
E)  Energy can be transferred but not lost as gas particles collide with each other and the container walls.F) A) and E)
G) B) and D) B

Question 11

Hydrogen sulfide gas (H2S, 34.08 g/mol)  can be produced from the reaction of aluminum sulfide (150.2 g/mol)  and water (18.02 g/mol)  according to the following reaction equation: AL2 S3 (s)  + 6 H2 O(l)   →\rightarrow→  3 H2 S(g)  + 2 Al(OH) 3 (s) 
If 65.0 g of Al2S3 reacts with excess H2O at 90.0  °\degree° C and 0.987 atm, what volume of H2S gas will be produced?

Accepted Answer

A)  39.2 L
B)  14.8 L
C)  13.1 L
D)  1.30 L
E)  44.3 L F) A) and C)
G) None of the above

Question 12

Which molecules in air-oxygen or nitrogen-have the highest average speeds? Explain.

Accepted Answer

The kinetic energies depend only on the ...

Question 13

Which of the following statements regarding the mixing of gases is correct?

Accepted Answer

A)  More massive gases settle to the bottom of a container, leaving lighter gases near the top.
B)  The relative proportions of gases in a mixture vary throughout the container, depending on the pressure.
C)  Nonpolar gases do not mix with polar gases.
D)  All gas mixtures are homogeneous.
E)  Gases mix more uniformly at lower temperatures.F) B) and C)
G) None of the above

Question 14

Calculate the root-mean-square speed of an O2 molecule with an average kinetic energy of 6.2 * 10-21 J at 252 molecule with an average kinetic energy of 6.2 * 10-21 J at 25 C.  (1 J = 1 kg . m2/s2; 1 mol = 6.02 * 1023)  A) 20 pm/s B) 230 km/s C) 480 m/s D) 120 m/s E) 230 m/s" class="answers-bank-image d-inline" rel="preload" >C.
 (1 J = 1 kg . m2/s2; 1 mol = 6.02 * 1023)

Accepted Answer

A)  20 pm/s
B)  230 km/s
C)  480 m/s
D)  120 m/s
E)  230 m/sF) B) and D)
G) B) and C)

Question 15

At a given temperature, the effusion rate of nitrogen gas is _______ times the rate of krypton.

Accepted Answer

A)  2.99
B)  0.409
C)  2.45
D)  0.578
E)  1.73F) C) and D)
G) A) and E)

Question 16

Which set of gases is listed from lowest to highest root-mean-square speed at 25 °\degree° C?

Accepted Answer

A)  Ne  <\lt< NO  <\lt<  Ar  <\lt<  CH4
B)  Ar  <\lt<  CH4  <\lt< NO  <\lt<  Ne
C)  CH4  <\lt< NO  <\lt<  Ar  <\lt<  Ne
D)  Ar  <\lt< NO  <\lt<  Ne  <\lt<  CH4
E)  CH4  <\lt<  Ne  <\lt<  NO  <\lt< Ar F) A) and B)
G) A) and C)

Question 17

_____-is how gases escape through a hole in a container; _____is how gases spread among each other.

Accepted Answer

A)  Diffusion; effusion
B)  Effusion; diffusion
C)  Effusion; effusion
D)  Diffusion; diffusionE) All of the above
F) None of the above

Question 18

Identify the correct way to complete the following statements regarding the properties of gases, using the choices in parentheses.
The volume of a gas is (directly/inversely) proportional to pressure.
The volume of a gas is directly/inversely) proportional to temperature.
The volume of a gas is (directly/inversely) proportional to number of gas particles present.
Mixtures of gases are (homogeneous/heterogeneous).
The density of a gas is (directly/inversely) proportional to its molar mass.
A gas escapes from a balloon at a rate that is (directly/inversely) proportional to its molar mass.

Accepted Answer

The volume of a gas is inversely proport...

Question 19

Suppose 3.95% of 521 g of PCl5 (208.2 g/mol)  initially present in a 10.0 L reaction vessel at 300 °\degree° C decomposes to form PCl3 (137.3 g/mol)  and Cl2 (70.90 g/mol) .What is the resulting pressure of PCl3?
PCl5 (g)   →\rightarrow→  PCl3 (g)  + CL2 (g)

Accepted Answer

A)  4.66 atm
B)  6.15 atm
C)  11.8 atm
D)  0.465 atm
E)  0.243 atm F) B) and E)
G) None of the above

Question 20

A sample of gas at 875 °\degree° C is allowed to cool at constant pressure until its volume is one-fourth of its original value.What is the final temperature of the gas?

Accepted Answer

A)  (-54.3 °\degree° 
C)  
B)  13.9 °\degree° C
C)  219 °\degree° C
D)  287 °\degree° C
E)  383 °\degree° C F) A) and D)
G) A) and B) B

Exam 10: Properties of Gases the Air We Breathe

What is the mole fraction of O₂ in a gas mixture with a total pressure of 750 torr when the partial pressure of O₂ is 125 torr?

Correct Answer
verified

Correct Answer
verified

What volume is occupied by 1.00 mol of an ideal gas at 1.00 atm and 0.00 $\degree$ C?

Correct Answer
verified

In an experiment, 8.65 grams of SF₆ gas are placed in a container at 27.5 $\degree$ C and 1.30 atm.What is the density of the gas?

Correct Answer
verified
7.70 g/L

Which of the following statements about the properties of gases is NOT correct?

Correct Answer
verified

Assuming all of these samples of gas are at the same temperature, which will escape through a hole in a balloon at the lowest rate?

Correct Answer
verified

How many moles of propane are contained in a 5.00 L tank at 450 torr and 25 $\degree$ C?

Correct Answer
verified

Calculate the average kinetic energy of CO₂ molecules with a root-mean-square speed of 629 m/s.Report your answer in kJ/mol.The mass of one CO₂ molecule is 7.31 * 10^-26 kg. (1 J = 1 kg . m²/s²; 1 mol =6.02 * 10²³)

Correct Answer
verified

At a given temperature, oxygen gas effuses 1.489 times faster than which of the following gases?

Correct Answer
verified

Which of the following statements regarding the kinetic molecular theory of gases is NOT correct?

Correct Answer
verified
B

Correct Answer
verified

Which molecules in air-oxygen or nitrogen-have the highest average speeds? Explain.

Correct Answer
verified
The kinetic energies depend only on the ...
View Answer

Which of the following statements regarding the mixing of gases is correct?

Correct Answer
verified

Calculate the root-mean-square speed of an O₂ molecule with an average kinetic energy of 6.2 * 10^-21 J at 25C. (1 J = 1 kg . m²/s²; 1 mol = 6.02 * 10²³)

Correct Answer
verified

At a given temperature, the effusion rate of nitrogen gas is _______ times the rate of krypton.

Correct Answer
verified

Which set of gases is listed from lowest to highest root-mean-square speed at 25 $\degree$ C?

Correct Answer
verified

_-is how gases escape through a hole in a container; _is how gases spread among each other.

Correct Answer
verified

Correct Answer
verified
The volume of a gas is inversely proport...
View Answer

Suppose 3.95% of 521 g of PCl₅ (208.2 g/mol) initially present in a 10.0 L reaction vessel at 300 $\degree$ C decomposes to form PCl₃ (137.3 g/mol) and Cl₂ (70.90 g/mol) .What is the resulting pressure of PCl₃? PCl₅ (g) $\rightarrow$ PCl₃ (g) + CL₂ (g)

Correct Answer
verified

A sample of gas at 875 $\degree$ C is allowed to cool at constant pressure until its volume is one-fourth of its original value.What is the final temperature of the gas?

Correct Answer
verified
B

Exam 10: Properties of Gases the Air We Breathe

What is the mole fraction of O2 in a gas mixture with a total pressure of 750 torr when the partial pressure of O2 is 125 torr?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What volume is occupied by 1.00 mol of an ideal gas at 1.00 atm and 0.00 °\degree° C?

Correct AnswerverifiedShow Answer

In an experiment, 8.65 grams of SF6 gas are placed in a container at 27.5 °\degree° C and 1.30 atm.What is the density of the gas?

Correct Answerverified7.70 g/L

Which of the following statements about the properties of gases is NOT correct?

Correct AnswerverifiedShow Answer

Assuming all of these samples of gas are at the same temperature, which will escape through a hole in a balloon at the lowest rate?

Correct AnswerverifiedShow Answer

How many moles of propane are contained in a 5.00 L tank at 450 torr and 25 °\degree° C?

Correct AnswerverifiedShow Answer

Calculate the average kinetic energy of CO2 molecules with a root-mean-square speed of 629 m/s.Report your answer in kJ/mol.The mass of one CO2 molecule is 7.31 * 10-26 kg. (1 J = 1 kg . m2/s2; 1 mol =6.02 * 1023)

Correct AnswerverifiedShow Answer

At a given temperature, oxygen gas effuses 1.489 times faster than which of the following gases?

Correct AnswerverifiedShow Answer

Which of the following statements regarding the kinetic molecular theory of gases is NOT correct?

Correct AnswerverifiedB

Correct AnswerverifiedShow Answer

Which molecules in air-oxygen or nitrogen-have the highest average speeds? Explain.

Correct AnswerverifiedThe kinetic energies depend only on the ...View AnswerShow Answer

Which of the following statements regarding the mixing of gases is correct?

Correct AnswerverifiedShow Answer

Calculate the root-mean-square speed of an O2 molecule with an average kinetic energy of 6.2 * 10-21 J at 25C. (1 J = 1 kg . m2/s2; 1 mol = 6.02 * 1023)

Correct AnswerverifiedShow Answer

At a given temperature, the effusion rate of nitrogen gas is _______ times the rate of krypton.

Correct AnswerverifiedShow Answer

Which set of gases is listed from lowest to highest root-mean-square speed at 25 °\degree° C?

Correct AnswerverifiedShow Answer

_____-is how gases escape through a hole in a container; _____is how gases spread among each other.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedThe volume of a gas is inversely proport...View AnswerShow Answer

Suppose 3.95% of 521 g of PCl5 (208.2 g/mol) initially present in a 10.0 L reaction vessel at 300 °\degree° C decomposes to form PCl3 (137.3 g/mol) and Cl2 (70.90 g/mol) .What is the resulting pressure of PCl3? PCl5 (g) →\rightarrow→ PCl3 (g) + CL2 (g)

Correct AnswerverifiedShow Answer

A sample of gas at 875 °\degree° C is allowed to cool at constant pressure until its volume is one-fourth of its original value.What is the final temperature of the gas?

Correct AnswerverifiedB

What is the mole fraction of O₂ in a gas mixture with a total pressure of 750 torr when the partial pressure of O₂ is 125 torr?

Correct Answer
verified

Correct Answer
verified

What volume is occupied by 1.00 mol of an ideal gas at 1.00 atm and 0.00 $\degree$ C?

Correct Answer
verified

In an experiment, 8.65 grams of SF₆ gas are placed in a container at 27.5 $\degree$ C and 1.30 atm.What is the density of the gas?

Correct Answer
verified
7.70 g/L

Correct Answer
verified

Correct Answer
verified

How many moles of propane are contained in a 5.00 L tank at 450 torr and 25 $\degree$ C?

Correct Answer
verified

Calculate the average kinetic energy of CO₂ molecules with a root-mean-square speed of 629 m/s.Report your answer in kJ/mol.The mass of one CO₂ molecule is 7.31 * 10^-26 kg. (1 J = 1 kg . m²/s²; 1 mol =6.02 * 10²³)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
B

Correct Answer
verified

Correct Answer
verified
The kinetic energies depend only on the ...
View Answer

Correct Answer
verified

Calculate the root-mean-square speed of an O₂ molecule with an average kinetic energy of 6.2 * 10^-21 J at 25C. (1 J = 1 kg . m²/s²; 1 mol = 6.02 * 10²³)

Correct Answer
verified

Correct Answer
verified

Which set of gases is listed from lowest to highest root-mean-square speed at 25 $\degree$ C?

Correct Answer
verified

_-is how gases escape through a hole in a container; _is how gases spread among each other.

Correct Answer
verified

Correct Answer
verified
The volume of a gas is inversely proport...
View Answer

Suppose 3.95% of 521 g of PCl₅ (208.2 g/mol) initially present in a 10.0 L reaction vessel at 300 $\degree$ C decomposes to form PCl₃ (137.3 g/mol) and Cl₂ (70.90 g/mol) .What is the resulting pressure of PCl₃? PCl₅ (g) $\rightarrow$ PCl₃ (g) + CL₂ (g)

Correct Answer
verified

A sample of gas at 875 $\degree$ C is allowed to cool at constant pressure until its volume is one-fourth of its original value.What is the final temperature of the gas?

Correct Answer
verified
B