Question 1

What is the formula which describes the relationship between the volume and number of moles in the sample at constant pressure and constant temperature?

Accepted Answer

A)  Vn = k3 
B)  V2 /n = k3 
C)  n/V2 = k3 
D)  V/n = k3 
E)  V = -k3n 
A)  Vn = k3 
B)  V2 /n = k3 
C)  n/V2 = k3 
D)  V/n = k3 
E)  V = -k3n

Question 2

A sample of hydrogen gas exerts a pressure of 466 torr in a container. What is this pressure in atmospheres? (1 atm = 1.01325 ×105 Pa = 760 torr)

Accepted Answer

A)  0.217 atm 
B)  0.466 atm 
C)  0.613 atm 
D)  1.63 atm 
E)  4.60 atm 
A)  0.217 atm 
B)  0.466 atm 
C)  0.613 atm 
D)  1.63 atm 
E)  4.60 atm

Question 3

A fixed quantity of gas, initially at 600ºC, undergoes a temperature change at constant pressure in a cylinder with a movable piston. What final temperature of the gas can result in the change of state depicted below?

Accepted Answer

A)  1473ºC 
B)  1200ºC 
C)  600ºC 
D)  300ºC 
E)  163ºC 
A)  1473ºC 
B)  1200ºC 
C)  600ºC 
D)  300ºC 
E)  163ºC

Question 4

In the van der Waals equation, the constant a is a constant that is part of a correction factor for ________.

Accepted Answer

A)  the volume of the gas 
B)  the temperature of the gas 
C)  the pressure of the gas 
D)  the ideal gas constant 
A)  the volume of the gas 
B)  the temperature of the gas 
C)  the pressure of the gas 
D)  the ideal gas constant

Question 5

If 2.38 mol of a gas has a volume of 120.0 mL, what is the volume of 1.97 mol of the gas at the same temperature and pressure?

Accepted Answer

A)  25.6 mL 
B)  99.3 mL 
C)  119 mL 
D)  145 mL 
E)  563 mL 
A)  25.6 mL 
B)  99.3 mL 
C)  119 mL 
D)  145 mL 
E)  563 mL

Question 6

________ is the formula to determine the amount of a reactant or product in units of moles using the ideal gas law.

Accepted Answer

The answer of ________ is the formula to determine the...

Question 7

What is the volume occupied by 25.2 g of CO2 at 0.840 atm and 25°C? (R = 0.08206 L • atm/K • mol)

Accepted Answer

A)  0.060 L 
B)  1.34 L 
C)  16.7 L 
D)  24.2 L 
E)  734 L 
A)  0.060 L 
B)  1.34 L 
C)  16.7 L 
D)  24.2 L 
E)  734 L

Question 8

State Avogadro's law.

Accepted Answer

Equal volumes of gas

Question 9

At -3°C, 2.5 moles of a gas in a 0.50-L container exert a pressure of 135 atm. Under these conditions, is the gas behaving like an ideal gas?

Accepted Answer

No. (The ideal gas l

Question 10

Which statement is false?

Accepted Answer

A)  The average kinetic energies of molecules from samples of different "ideal" gases are the same at the same temperature. 
B)  The molecules of an ideal gas are relatively far apart. 
C)  All molecules of an ideal gas have the same kinetic energy at constant temperature. 
D)  Molecules of a gas undergo many collisions with each other and the container walls. 
E)  Molecules of greater mass have a lower average speed than those of less mass at the same temperature. 
A)  The average kinetic energies of molecules from samples of different "ideal" gases are the same at the same temperature. 
B)  The molecules of an ideal gas are relatively far apart. 
C)  All molecules of an ideal gas have the same kinetic energy at constant temperature. 
D)  Molecules of a gas undergo many collisions with each other and the container walls. 
E)  Molecules of greater mass have a lower average speed than those of less mass at the same temperature.

Question 11

For real gases, PV > nRT.

Accepted Answer

A) True 
 B)False

Question 12

If a liquid boils at -75°C then what is the temperature in kelvins?

Accepted Answer

The answer of If a liquid boils at -75°C then...

Question 13

What is the mole fraction of NO in a 55.0-L gas cylinder at 30°C which comes from a mixture of N2 and NO if the cylinder contains 3.238 mol of N2 at a total pressure of 2.14 atm?

Accepted Answer

Question 14

A gas sample occupies 8.76 L at a temperature of 37°C. What is the volume if the temperature is lowered to 0°C at constant pressure?

Accepted Answer

A)  9.95 L 
B)  0 L 
C)  4.22 L 
D)  74.1 L 
E)  7.71 L 
A)  9.95 L 
B)  0 L 
C)  4.22 L 
D)  74.1 L 
E)  7.71 L

Question 15

Which is not a property of a gas?

Accepted Answer

A)  The density of a gaseous substance varies greatly with temperature. 
B)  A sample of gas assumes the shape and volume of its container. 
C)  Gases are highly compressible. 
D)  The densities of gases are much larger than those of corresponding liquids. 
E)  Gases form homogeneous mixtures with one another in any proportion. 
A)  The density of a gaseous substance varies greatly with temperature. 
B)  A sample of gas assumes the shape and volume of its container. 
C)  Gases are highly compressible. 
D)  The densities of gases are much larger than those of corresponding liquids. 
E)  Gases form homogeneous mixtures with one another in any proportion.

Question 16

The molecules of different samples of an ideal gas have the same average kinetic energies at the same ________.

Accepted Answer

A)  pressure 
B)  temperature 
C)  volume 
D)  density 
A)  pressure 
B)  temperature 
C)  volume 
D)  density

Question 17

If 2.3 mol of a gas occupies 50.5 mL, how many moles of the gas will occupy 85.5 mL at the same temperature and pressure?

Accepted Answer

A)  1.4 mol 
B)  0.59 mol 
C)  3.9 mol 
D)  0.26 mol 
E)  2.3 mol 
A)  1.4 mol 
B)  0.59 mol 
C)  3.9 mol 
D)  0.26 mol 
E)  2.3 mol

Question 18

Which sample of gas is least likely to behave ideally?

Accepted Answer

A)  1 mol He(g) at 400 K, 1 atm pressure 
B)  1 mol Ne(g) at 400 K, 1 atm pressure 
C)  1 mol H2(g) at 400 K, 1 atm pressure 
D)  1 mol O2(g) at 400 K, 1 atm pressure 
E)  1 mol H2O(g) at 400 K, 1 atm pressure 
A)  1 mol He(g) at 400 K, 1 atm pressure 
B)  1 mol Ne(g) at 400 K, 1 atm pressure 
C)  1 mol H2(g) at 400 K, 1 atm pressure 
D)  1 mol O2(g) at 400 K, 1 atm pressure 
E)  1 mol H2O(g) at 400 K, 1 atm pressure

Question 19

The pressure of sulfur dioxide in a container is 159 kPa. What is this pressure in atmospheres? (1 atm = 101,325 Pa = 760 torr)?

Accepted Answer

A)  0.209 atm 
B)  0.637 atm 
C)  1.57 atm 
D)  21.2 atm 
E)  1.59 ×104 atm 
A)  0.209 atm 
B)  0.637 atm 
C)  1.57 atm 
D)  21.2 atm 
E)  1.59 ×104 atm

Question 20

Which of the following gas molecules have the highest average kinetic energy at 25°C?

Accepted Answer

A)  H2 
B)  O2 
C)  N2 
D)  Cl2 
E)  All the gases have the same average kinetic energy. 
A)  H2 
B)  O2 
C)  N2 
D)  Cl2 
E)  All the gases have the same average kinetic energy.

Exam 10: Gases

What is the formula which describes the relationship between the volume and number of moles in the sample at constant pressure and constant temperature?

A sample of hydrogen gas exerts a pressure of 466 torr in a container. What is this pressure in atmospheres? (1 atm = 1.01325 ×105 Pa = 760 torr)

A fixed quantity of gas, initially at 600ºC, undergoes a temperature change at constant pressure in a cylinder with a movable piston. What final temperature of the gas can result in the change of state depicted below?

In the van der Waals equation, the constant a is a constant that is part of a correction factor for ________.

If 2.38 mol of a gas has a volume of 120.0 mL, what is the volume of 1.97 mol of the gas at the same temperature and pressure?

________ is the formula to determine the amount of a reactant or product in units of moles using the ideal gas law.

What is the volume occupied by 25.2 g of CO2 at 0.840 atm and 25°C? (R = 0.08206 L • atm/K • mol)

State Avogadro's law.

At -3°C, 2.5 moles of a gas in a 0.50-L container exert a pressure of 135 atm. Under these conditions, is the gas behaving like an ideal gas?

Which statement is false?

For real gases, PV > nRT.

If a liquid boils at -75°C then what is the temperature in kelvins?

What is the mole fraction of NO in a 55.0-L gas cylinder at 30°C which comes from a mixture of N2 and NO if the cylinder contains 3.238 mol of N2 at a total pressure of 2.14 atm?

A gas sample occupies 8.76 L at a temperature of 37°C. What is the volume if the temperature is lowered to 0°C at constant pressure?

Which is not a property of a gas?

The molecules of different samples of an ideal gas have the same average kinetic energies at the same ________.

If 2.3 mol of a gas occupies 50.5 mL, how many moles of the gas will occupy 85.5 mL at the same temperature and pressure?

Which sample of gas is least likely to behave ideally?

The pressure of sulfur dioxide in a container is 159 kPa. What is this pressure in atmospheres? (1 atm = 101,325 Pa = 760 torr)?

Which of the following gas molecules have the highest average kinetic energy at 25°C?

Chemistry: the Central Science

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A sample of hydrogen gas exerts a pressure of 466 torr in a container. What is this pressure in atmospheres? (1 atm = 1.01325 ×10⁵ Pa = 760 torr)

What is the volume occupied by 25.2 g of CO₂ at 0.840 atm and 25°C? (R = 0.08206 L • atm/K • mol)

What is the mole fraction of NO in a 55.0-L gas cylinder at 30°C which comes from a mixture of N₂ and NO if the cylinder contains 3.238 mol of N₂ at a total pressure of 2.14 atm?