Question 1

For real gases, PV > nRT, always.

Accepted Answer

A) True 
 B)False

Question 2

Which of the lines on the figure below is the best representation of the relationship between the volume of a gas and its absolute temperature, other factors remaining constant?

Accepted Answer

A)   a
B)   b
C)   c
D)   d
E)   eF) C) and E)
G) A) and C)

Question 3

A gas mixture, with a total pressure of 300. torr, consists of equal masses of Ne (atomic weight 20.) and Ar (atomic weight 40.) . What is the partial pressure of Ar, in torr?

Accepted Answer

A)   75 torr
B)   100. torr
C)   150. torr
D)   200. torr
E)   None of these choices is correct.F) A) and B)
G) D) and E)

Question 4

A compressed gas cylinder containing 1.50 mol methane has a volume of 3.30 L. What pressure does the methane exert on the walls of the cylinder if its temperature is 25 °\degree° C?

Accepted Answer

A)   9.00 *¯2 atm
B)   0.933 atm
C)   1.11 atm
D)   1.70 atm
E)   11.1 atm F) A) and E)
G) B) and E)

Question 5

Lithium oxide is an effective absorber of carbon dioxide and can be used to purify air in confined areas such as space vehicles. What volume of carbon dioxide can be absorbed by 1.00 kg of lithium oxide at 25 °\degree° C and 1.00 atm? Li2O(aq)  + CO2(g)   →\rightarrow→ Li2CO3(s)

Accepted Answer

A)   687 mL
B)   819 mL
C)   687 L
D)   819 L
E)   22.4 L F) All of the above
G) B) and E)

Question 6

Helium gas is being pumped into a rigid container at a constant temperature. As a result, the pressure of helium in the container is increasing. Select the one correct statement below.

Accepted Answer

A)   As the pressure increases, helium atoms move faster, on average.
B)   As the pressure increases, helium atoms move more slowly, on average.
C)   As the pressure increases, the volume of the container must decrease.
D)   As the pressure increases, helium atoms stay closer to the wall of the container, on average.
E)   As the pressure increases, there are more collisions of helium atoms with the container wall.F) B) and C)
G) A) and E)

Question 7

Hydrogen gas exerts a pressure of 466 torr in a container. What is this pressure in atmospheres?

Accepted Answer

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

Question 8

"The volume of an ideal gas is directly proportional to its absolute temperature at constant pressure and number of moles" is a statement of ________________ Law.

Accepted Answer

A)   Charles's
B)   Boyle's
C)   Amontons's
D)   Avogadro's
E)   Dalton'sF) A) and B)
G) All of the above

Question 9

What is the pressure in a 7.50-L flask if 0.15 mol of carbon dioxide is added to 0.33 mol of oxygen? The temperature of the mixture is 48.0 °\degree° C.

Accepted Answer

A)   0.252 atm
B)   0.592 atm
C)   1.69 atm
D)   3.96 atm
E)   4.80 atm F) None of the above
G) A) and E)

Question 10

A 250.0-mL sample of ammonia, NH3(g) , exerts a pressure of 833 torr at 42.4 °\degree° C. What mass of ammonia is in the container?

Accepted Answer

A)   0.0787 g
B)   0.180 g
C)   8.04 g
D)   17.0 g
E)   59.8 g F) A) and B)
G) A) and D)

Question 11

Hydrochloric acid is prepared by bubbling hydrogen chloride gas through water. What is the concentration of a solution prepared by dissolving 225 L of HCl(g)  at 37 °\degree° C and 89.6 kPa in 5.25 L of water?

Accepted Answer

A)   1.49 M
B)   1.66 M
C)   7.82 M
D)   12.5 M
E)   16.6 M F) A) and E)
G) C) and D)

Question 12

At very high pressures (~ 1000 atm) , the measured pressure exerted by real gases is greater than that predicted by the ideal gas equation. This is mainly because

Accepted Answer

A)   such high pressures cannot be accurately measured.
B)   real gases will condense to form liquids at 1000 atm pressure.
C)   gas phase collisions prevent molecules from colliding with the walls of the container.
D)   of attractive intermolecular forces between gas molecules.
E)   the volume occupied by the gas molecules themselves becomes significant.F) B) and D)
G) C) and D)

Question 13

According to the kinetic theory of gases, in a collision between two molecules the kinetic energy of one molecule will decrease by the same amount that the kinetic energy of the other one increases.

Accepted Answer

A) True 
 B)False

Question 14

Select the statement which does NOT apply to an ideal gas.

Accepted Answer

A)   There are no attractive forces between the gas molecules.
B)   There are strong repulsive forces between the gas molecules.
C)   The volume occupied by the molecules is negligible compared to the container volume.
D)   The gas behaves according to the ideal gas equation.
E)   The average kinetic energy of the molecules is proportional to the absolute temperature.F) A) and B)
G) All of the above

Question 15

For a pure gas sample, the average kinetic energy is also the most probable kinetic energy.

Accepted Answer

A) True 
 B)False

Question 16

Calculate the rms speed of carbon dioxide molecules at STP.

Accepted Answer

A)   12.4 m/s
B)   155m/s
C)   393 m/s
D)   1.55 * 105 m/s
E)   The answer can't be calculated without more data.F) None of the above
G) A) and B)

Question 17

A ballerina weighs 103 lbs and is up on her toes with only 10.0 cm2 of her slippers in contact with the floor. What pressure is she exerting on the floor?

Accepted Answer

A)   4.59 *105 Pa
B)   4.59 * 103 Pa
C)   4.59 * 101 Pa
D)   4.59 * 10¯1 Pa
E)   4.59 * 10¯3 PaF) A) and D)
G) A) and C)

Question 18

Which of the following changes will NOT affect the total pressure of gas in a container, assuming all other factors remain constant?

Accepted Answer

A)   The frequency of collisions of molecules with the walls is increased.
B)   The average velocity of the molecules is lowered.
C)   The temperature of the sample is altered.
D)   Half of the molecules are replaced by an equal number of molecules of a gas with a different molecular weight.
E)   The total number of molecules is altered.F) A) and D)
G) A) and C)

Question 19

At moderate pressures (~ 200 atm) , the measured pressure exerted by CO2 gas is less than that predicted by the ideal gas equation. This is mainly because

Accepted Answer

A)   such high pressures cannot be accurately measured.
B)   CO2 will condense to a liquid at 200 atm pressure.
C)   gas phase collisions prevent CO2 molecules from colliding with the walls of the container.
D)   of attractive intermolecular forces between CO2 molecules.
E)   the volume occupied by the CO2 molecules themselves becomes significant.F) B) and E)
G) A) and B)

Question 20

Nitrogen dioxide is a red-brown gas that is responsible for the color of photochemical smog. A sample of nitrogen dioxide has a volume of 28.6 L at 45.3 °\degree° C and 89.9 kPa. What is its volume at STP?

Accepted Answer

A)   21.8 L
B)   27.6 L
C)   29.6 L
D)   37.6 L
E)   153 L F) B) and D)
G) All of the above

Exam 5: Gases and the Kinetic-Molecular Theory

Hydrochloric acid is prepared by bubbling hydrogen chloride gas through water. What is the concentration of a solution prepared by dissolving 225 L of HCl(g) at 37 °\degree° C and 89.6 kPa in 5.25 L of water?

Correct AnswerverifiedShow Answer

Which of the following changes will NOT affect the total pressure of gas in a container, assuming all other factors remain constant?

Correct AnswerverifiedShow Answer

Nitrogen dioxide is a red-brown gas that is responsible for the color of photochemical smog. A sample of nitrogen dioxide has a volume of 28.6 L at 45.3 °\degree° C and 89.9 kPa. What is its volume at STP?

Correct AnswerverifiedShow Answer

What is the pressure in a 7.50-L flask if 0.15 mol of carbon dioxide is added to 0.33 mol of oxygen? The temperature of the mixture is 48.0 °\degree° C.

Correct AnswerverifiedShow Answer

Helium gas is being pumped into a rigid container at a constant temperature. As a result, the pressure of helium in the container is increasing. Select the one correct statement below.

Correct AnswerverifiedShow Answer

At very high pressures (~ 1000 atm) , the measured pressure exerted by real gases is greater than that predicted by the ideal gas equation. This is mainly because

Correct AnswerverifiedShow Answer

Calculate the rms speed of carbon dioxide molecules at STP.

Correct AnswerverifiedShow Answer

For real gases, PV > nRT, always.

Correct AnswerverifiedShow Answer

"The volume of an ideal gas is directly proportional to its absolute temperature at constant pressure and number of moles" is a statement of ________________ Law.

Correct AnswerverifiedShow Answer

Select the statement which does NOT apply to an ideal gas.

Correct AnswerverifiedShow Answer

A 250.0-mL sample of ammonia, NH3(g) , exerts a pressure of 833 torr at 42.4 °\degree° C. What mass of ammonia is in the container?

Correct AnswerverifiedShow Answer

At moderate pressures (~ 200 atm) , the measured pressure exerted by CO2 gas is less than that predicted by the ideal gas equation. This is mainly because

Correct AnswerverifiedShow Answer

A ballerina weighs 103 lbs and is up on her toes with only 10.0 cm2 of her slippers in contact with the floor. What pressure is she exerting on the floor?

Correct AnswerverifiedShow Answer

According to the kinetic theory of gases, in a collision between two molecules the kinetic energy of one molecule will decrease by the same amount that the kinetic energy of the other one increases.

Correct AnswerverifiedShow Answer

A compressed gas cylinder containing 1.50 mol methane has a volume of 3.30 L. What pressure does the methane exert on the walls of the cylinder if its temperature is 25 °\degree° C?

Correct AnswerverifiedShow Answer

For a pure gas sample, the average kinetic energy is also the most probable kinetic energy.

Correct AnswerverifiedShow Answer

Lithium oxide is an effective absorber of carbon dioxide and can be used to purify air in confined areas such as space vehicles. What volume of carbon dioxide can be absorbed by 1.00 kg of lithium oxide at 25 °\degree° C and 1.00 atm? Li2O(aq) + CO2(g) →\rightarrow→ Li2CO3(s)

Correct AnswerverifiedShow Answer

Which of the lines on the figure below is the best representation of the relationship between the volume of a gas and its absolute temperature, other factors remaining constant?

Correct AnswerverifiedShow Answer

Hydrogen gas exerts a pressure of 466 torr in a container. What is this pressure in atmospheres?

Correct AnswerverifiedShow Answer

A gas mixture, with a total pressure of 300. torr, consists of equal masses of Ne (atomic weight 20.) and Ar (atomic weight 40.) . What is the partial pressure of Ar, in torr?

Correct AnswerverifiedShow Answer

Hydrochloric acid is prepared by bubbling hydrogen chloride gas through water. What is the concentration of a solution prepared by dissolving 225 L of HCl(g) at 37 $\degree$ C and 89.6 kPa in 5.25 L of water?

Correct Answer
verified

Correct Answer
verified

Nitrogen dioxide is a red-brown gas that is responsible for the color of photochemical smog. A sample of nitrogen dioxide has a volume of 28.6 L at 45.3 $\degree$ C and 89.9 kPa. What is its volume at STP?

Correct Answer
verified

What is the pressure in a 7.50-L flask if 0.15 mol of carbon dioxide is added to 0.33 mol of oxygen? The temperature of the mixture is 48.0 $\degree$ C.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A 250.0-mL sample of ammonia, NH₃(g) , exerts a pressure of 833 torr at 42.4 $\degree$ C. What mass of ammonia is in the container?

Correct Answer
verified

At moderate pressures (~ 200 atm) , the measured pressure exerted by CO₂ gas is less than that predicted by the ideal gas equation. This is mainly because

Correct Answer
verified

A ballerina weighs 103 lbs and is up on her toes with only 10.0 cm² of her slippers in contact with the floor. What pressure is she exerting on the floor?

Correct Answer
verified

Correct Answer
verified

A compressed gas cylinder containing 1.50 mol methane has a volume of 3.30 L. What pressure does the methane exert on the walls of the cylinder if its temperature is 25 $\degree$ C?

Correct Answer
verified

Correct Answer
verified

Lithium oxide is an effective absorber of carbon dioxide and can be used to purify air in confined areas such as space vehicles. What volume of carbon dioxide can be absorbed by 1.00 kg of lithium oxide at 25 $\degree$ C and 1.00 atm? Li₂O(aq) + CO₂(g) $\rightarrow$ Li₂CO₃(s)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified