Question 1

________ is how gases spread among each other, and ________ is how gases escape through a hole in a container.

Accepted Answer

A) Diffusion; effusion 
B) Effusion; diffusion 
C) Effusion; effusion 
D) Diffusion; diffusion

Question 2

A gas was found to diffuse twice as slow as helium. Based on molar mass, which of the following was the gas?

Accepted Answer

A) CO 
B) H2 
C) F2 
D) CH4 
E) Ne

Question 3

Which set of gases is listed from slowest to fastest diffusion rate?

Accepted Answer

A) HCN  F1F1F1S1F1F1F10H2  F1F1F1S1F1F1F10He  F1F1F1S1F1F1F10O3 
B) H2  F1F1F1S1F1F1F10He  F1F1F1S1F1F1F10HCN  F1F1F1S1F1F1F10O3 
C) O3  F1F1F1S1F1F1F10HCN  F1F1F1S1F1F1F10He  F1F1F1S1F1F1F10H2 
D) HCN  F1F1F1S1F1F1F10He  F1F1F1S1F1F1F10O3  F1F1F1S1F1F1F10H2 
E) H2  F1F1F1S1F1F1F10HCN  F1F1F1S1F1F1F10He  F1F1F1S1F1F1F10O3

Question 4

A balloon is filled with 3.00 L of helium at a pressure of 765 torr. What is the volume of the balloon at an altitude where the pressure in the balloon is 530 torr?

Accepted Answer

A) 0.231 L 
B) 4.33 L 
C) 2.08 L 
D) 1.00 L 
E) 3.00 L

Question 5

How many moles of propane are contained in a 5.00F1F1F1S1F1F1F10L tank at 450 torr and 25F1F1F1S1F1F1F10C?

Accepted Answer

A) 0.12 mol 
B) 92 mol 
C) 1.4 mol 
D) 1,100 mol 
E) 41 mol

Question 6

Which of the following graphs shows the correct relationship between the temperature and volume of an ideal gas at a given pressure? Note the origin corresponds to V F1F1F1S1F1F1F10 0 and T F1F1F1S1F1F1F10 0.

Accepted Answer

A)   
B)   
C)   
D)

Question 7

Which of the following figures is the most accurate representation of a gas sample? The arrows show the velocities of individual molecules.

Accepted Answer

A)   
B)   
C)   
D)

Question 8

The cold inflation pressure of many car tires is 30 lb/in2, which is the gauge pressure. If 1 atm F1F1F1S1F1F1F10 14.7 lb/in2, what is the gauge pressure of a car tire in torr?

Accepted Answer

A) 2.04 torr 
B) 1.55  F1F1F1S1F1F1F10torr 
C) 441 torr 
D) 0.580 torr 
E) 1.12  F1F1F1S1F1F1F10torr

Question 9

If the pressure of a gas triples, by what factor does the volume change, assuming constant temperature?

Accepted Answer

A) 1/3 
B) 3 
C) 1 
D) 9 
E) 1/9

Question 10

Dry air consists of 78.1% nitrogen (28 g/mol), 20.9% oxygen (32 g/mol), 0.9% argon (40 g/mol), 0.03% carbon dioxide (44 g/mol), and 0.07% other gases by volume. Which gas has the largest mole fraction in the composition of air?

Accepted Answer

A) nitrogen 
B) oxygen 
C) argon 
D) carbon dioxide 
E) the total of the other gases

Question 11

The density of a pure gas at STP depends on its ________

Accepted Answer

A) molar mass. 
B) concentration. 
C) temperature. 
D) volume. 
E) pressure.

Question 12

In a mixture of gases present in equimolar amounts where the total pressure is known, which of the following is not true?

Accepted Answer

A) The sum of the partial pressures of the gases equals the total pressure. 
B) The mole fraction of each gas is the same. 
C) The mass of each gas is the same. 
D) The partial pressure exerted by each gas is the same. 
E) The identity of the gases is not necessary to calculate the total pressure.

Question 13

Which of these gases (Ar, N2O, H2) has the same average kinetic energy at 25F1F1F1S1F1F1F10C as CO2?

Accepted Answer

A) Ar 
B) N2O 
C) H2 
D) They are all the same as CO2. 
E) They are all different from CO2.

Question 14

Nitrous oxide (N2O, also known as laughing gas) has been used as an anesthetic. What is the density of N2O at 750 torr and 30F1F1F1S1F1F1F10C?

Accepted Answer

A) 1.2 g/L 
B) 1.1 g/L 
C) 1.9 g/L 
D) 1.7 g/L 
E) 1.5 g/L

Question 15

How high (in feet) can one atmosphere of pressure raise a column of water? The density of mercury is 13.8 g/cm³, and the density of water is 1.00 g/cm³.

Accepted Answer

The answer of How high (in feet) can one atmosphere...

Question 16

Gases can typically be mixed in any proportion, unless they chemically react. This property is called ________

Accepted Answer

A) density. 
B) miscibility. 
C) diffusion. 
D) immiscibility. 
E) effusion.

Question 17

An unknown gas held in a 25.0 mL flask at 45°F exerts a pressure of 25 mtorr. Using this information with the ideal gas law, it is possible to determine ________

Accepted Answer

A) the mass of the gas in the container. 
B) the identity of the gas in the container. 
C) the number of molecules of the gas in the container. 
D) the molecular geometry of the gas in the container. 
E) nothing more about the gas.

Question 18

What is the molar mass of a gas that has a density of 2.62 g/L at 2.00 atm and 25.0F1F1F1S1F1F1F10C?

Accepted Answer

A) 32.0 g/mol 
B) 16.0 g/mol 
C) 64.0 g/mol 
D) 28.0 g/mol 
E) 2.69 g/mol

Question 19

Automobile air bags inflate during a crash or sudden stop by the rapid generation of nitrogen gas from sodium azide. 2NaN3(s)  F1F1F1S1F1F1F102Na(s)  F1F1F1S1F1F1F103N2(g)
How many moles of sodium azide are needed to produce sufficient nitrogen to fill a 50.0 L air bag to a pressure of 1.25 atm at 25°C?

Accepted Answer

A) 2.56 mol 
B) 3.83 mol 
C) 5.31 mol 
D) 1.70 mol 
E) 4.92 mol

Question 20

Which of the containers shown below has the lowest total pressure? The white circles represent helium atoms; the dark circles represent argon atoms.

Accepted Answer

A)   
B)   
C)   
D)

Exam 6: Properties of Gases: The Air We Breathe

is how gases spread among each other, and is how gases escape through a hole in a container.

A gas was found to diffuse twice as slow as helium. Based on molar mass, which of the following was the gas?

Which set of gases is listed from slowest to fastest diffusion rate?

A balloon is filled with 3.00 L of helium at a pressure of 765 torr. What is the volume of the balloon at an altitude where the pressure in the balloon is 530 torr?

How many moles of propane are contained in a 5.00L tank at 450 torr and 25C?

Which of the following graphs shows the correct relationship between the temperature and volume of an ideal gas at a given pressure? Note the origin corresponds to V  0 and T  0.

Which of the following figures is the most accurate representation of a gas sample? The arrows show the velocities of individual molecules.

The cold inflation pressure of many car tires is 30 lb/in², which is the gauge pressure. If 1 atm  14.7 lb/in², what is the gauge pressure of a car tire in torr?

If the pressure of a gas triples, by what factor does the volume change, assuming constant temperature?

Dry air consists of 78.1% nitrogen (28 g/mol) , 20.9% oxygen (32 g/mol) , 0.9% argon (40 g/mol) , 0.03% carbon dioxide (44 g/mol) , and 0.07% other gases by volume. Which gas has the largest mole fraction in the composition of air?

The density of a pure gas at STP depends on its ________

In a mixture of gases present in equimolar amounts where the total pressure is known, which of the following is not true?

Which of these gases (Ar, N₂O, H₂) has the same average kinetic energy at 25C as CO₂?

Nitrous oxide (N₂O, also known as laughing gas) has been used as an anesthetic. What is the density of N₂O at 750 torr and 30C?

How high (in feet) can one atmosphere of pressure raise a column of water? The density of mercury is 13.8 g/cm³, and the density of water is 1.00 g/cm³.

Gases can typically be mixed in any proportion, unless they chemically react. This property is called ________

An unknown gas held in a 25.0 mL flask at 45°F exerts a pressure of 25 mtorr. Using this information with the ideal gas law, it is possible to determine ________

What is the molar mass of a gas that has a density of 2.62 g/L at 2.00 atm and 25.0C?

Automobile air bags inflate during a crash or sudden stop by the rapid generation of nitrogen gas from sodium azide. 2NaN₃(s) 2Na(s) 3N₂(g) How many moles of sodium azide are needed to produce sufficient nitrogen to fill a 50.0 L air bag to a pressure of 1.25 atm at 25°C?

Which of the containers shown below has the lowest total pressure? The white circles represent helium atoms; the dark circles represent argon atoms.

Exam 6: Properties of Gases: The Air We Breathe

________ is how gases spread among each other, and ________ is how gases escape through a hole in a container.

A gas was found to diffuse twice as slow as helium. Based on molar mass, which of the following was the gas?

Which set of gases is listed from slowest to fastest diffusion rate?

A balloon is filled with 3.00 L of helium at a pressure of 765 torr. What is the volume of the balloon at an altitude where the pressure in the balloon is 530 torr?

How many moles of propane are contained in a 5.00L tank at 450 torr and 25C?

Which of the following graphs shows the correct relationship between the temperature and volume of an ideal gas at a given pressure? Note the origin corresponds to V  0 and T  0.

Which of the following figures is the most accurate representation of a gas sample? The arrows show the velocities of individual molecules.

The cold inflation pressure of many car tires is 30 lb/in2, which is the gauge pressure. If 1 atm  14.7 lb/in2, what is the gauge pressure of a car tire in torr?

If the pressure of a gas triples, by what factor does the volume change, assuming constant temperature?

Dry air consists of 78.1% nitrogen (28 g/mol) , 20.9% oxygen (32 g/mol) , 0.9% argon (40 g/mol) , 0.03% carbon dioxide (44 g/mol) , and 0.07% other gases by volume. Which gas has the largest mole fraction in the composition of air?

The density of a pure gas at STP depends on its ________

In a mixture of gases present in equimolar amounts where the total pressure is known, which of the following is not true?

Which of these gases (Ar, N2O, H2) has the same average kinetic energy at 25C as CO2?

Nitrous oxide (N2O, also known as laughing gas) has been used as an anesthetic. What is the density of N2O at 750 torr and 30C?

How high (in feet) can one atmosphere of pressure raise a column of water? The density of mercury is 13.8 g/cm3, and the density of water is 1.00 g/cm3.

Gases can typically be mixed in any proportion, unless they chemically react. This property is called ________

An unknown gas held in a 25.0 mL flask at 45°F exerts a pressure of 25 mtorr. Using this information with the ideal gas law, it is possible to determine ________

What is the molar mass of a gas that has a density of 2.62 g/L at 2.00 atm and 25.0C?

Automobile air bags inflate during a crash or sudden stop by the rapid generation of nitrogen gas from sodium azide. 2NaN3(s) 2Na(s) 3N2(g) How many moles of sodium azide are needed to produce sufficient nitrogen to fill a 50.0 L air bag to a pressure of 1.25 atm at 25°C?

Which of the containers shown below has the lowest total pressure? The white circles represent helium atoms; the dark circles represent argon atoms.

is how gases spread among each other, and is how gases escape through a hole in a container.

The cold inflation pressure of many car tires is 30 lb/in², which is the gauge pressure. If 1 atm  14.7 lb/in², what is the gauge pressure of a car tire in torr?

Which of these gases (Ar, N₂O, H₂) has the same average kinetic energy at 25C as CO₂?

Nitrous oxide (N₂O, also known as laughing gas) has been used as an anesthetic. What is the density of N₂O at 750 torr and 30C?

How high (in feet) can one atmosphere of pressure raise a column of water? The density of mercury is 13.8 g/cm³, and the density of water is 1.00 g/cm³.

Automobile air bags inflate during a crash or sudden stop by the rapid generation of nitrogen gas from sodium azide. 2NaN₃(s) 2Na(s) 3N₂(g) How many moles of sodium azide are needed to produce sufficient nitrogen to fill a 50.0 L air bag to a pressure of 1.25 atm at 25°C?