Question 1

A sample of nitrogen gas at 298 K and 745 torr has a volume of 37.42 L. What volume will it occupy if the pressure is increased to 894 torr at constant temperature?

Accepted Answer

A)   22.3 L
B)   31.2 L
C)   44.9 L
D)   112 L
E)   380 L

Question 2

Nitrogen will behave most like an ideal gas

Accepted Answer

A)   at high temperature and high pressure.
B)   at high temperature and low pressure.
C)   at low temperature and high pressure.
D)   at low temperature and low pressure.
E)   at intermediate (moderate)  temperature and pressure.

Question 3

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°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

Question 4

For an ideal gas, a plot of PV/nRT versus P gives a straight line with a positive slope.

Accepted Answer

A) True 
 B)False

Question 5

Select the gas with the highest average kinetic energy per mole at 298 K.

Accepted Answer

A)   O2
B)   CO2
C)   H2O
D)   H2
E)   All have the same average kinetic energy.

Question 6

According to the postulates of kinetic-molecular theory, the molecules of all gases at a given temperature have the same average kinetic energy.

Accepted Answer

A) True 
 B)False

Question 7

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

Accepted Answer

A)   a
B)   b
C)   c
D)   d
E)   e

Question 8

A flask containing helium gas is connected to an open-ended mercury manometer. The open end is exposed to the atmosphere, where the prevailing pressure is 752 torr. The mercury level in the open arm is 26 mm above that in the arm connected to the flask of helium. What is the helium pressure, in torr?

Accepted Answer

A)   -26 torr
B)   26 torr
C)   726 torr
D)   778 torr
E)   None of these choices are correct.

Question 9

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 are correct.

Question 10

"The rate of effusion of a gas is inversely proportional to the square root of its molar mass" is a\ statement of ______________________ Law.

Accepted Answer

A)   Charles's
B)   Graham's
C)   Dalton's
D)   Avogadro's
E)   Boyle's

Question 11

A sample of propane, a component of LP gas, has a volume of 35.3 L at 315 K and 922 torr. What is its volume at STP?

Accepted Answer

A)   25.2 L
B)   30.6 L
C)   33.6 L
D)   37.1 L
E)   49.2 L

Question 12

Calculate the rms speed of carbon dioxide molecules at STP.

Accepted Answer

A)   12.4 m/s
B)   155 m/s
C)   393 m/s
D)   1.55 × 105 m/s
E)   The answer can't be calculated without more data.

Question 13

Given that pressure has dimensions of force ÷ area; that force has dimensions of mass × acceleration; and that the S.I. unit of pressure is the pascal, what is 1 pascal in terms of S.I. base units?

Accepted Answer

A)   1 Pa = 1000 g/cm·s2
B)   1 Pa = 1 g/m·s2
C)   1 Pa = 10-3 kg·m/s2
D)   1 Pa = 1 kg·m/s2
E)   1 Pa = 1 kg/m·s2

Question 14

A flask with a volume of 3.16 L contains 9.33 grams of an unknown gas at 32.0°C and 1.00 atm. What is the molar mass of the gas?

Accepted Answer

A)   7.76 g/mol
B)   66.1 g/mol
C)   74.0 g/mol
D)   81.4 g/mol
E)   144 g/mol

Question 15

For real gases, PV > nRT, always.

Accepted Answer

A) True 
 B)False

Question 16

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.

Question 17

Methane, CH4(g) , reacts with steam to give synthesis gas, a mixture of carbon monoxide and hydrogen, which is used as starting material for the synthesis of a number of organic and inorganic compounds. CH4(g)  + H2O(g)  → CO(g)  + H2(g)  [unbalanced]
What mass of hydrogen is formed if 275 L of methane (measured at STP)  is converted to synthesis gas?

Accepted Answer

A)   12.3 g
B)   24.7 g
C)   37.1 g
D)   49.4 g
E)   74.2 g

Exam 5: Gases and the Kinetic-Molecular Theory

Select the gas with the highest average kinetic energy per mole at 298 K.

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°C and 89.9 kPa. What is its volume at STP?

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

According to the postulates of kinetic-molecular theory, the molecules of all gases at a given temperature have the same average kinetic energy.

Correct Answer
verified

For an ideal gas, a plot of PV/nRT versus P gives a straight line with a positive slope.

Correct Answer
verified

A flask with a volume of 3.16 L contains 9.33 grams of an unknown gas at 32.0°C and 1.00 atm. What is the molar mass of the gas?

Correct Answer
verified

"The rate of effusion of a gas is inversely proportional to the square root of its molar mass" is a\ statement of ______________________ Law.

Correct Answer
verified

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 Answer
verified

A sample of nitrogen gas at 298 K and 745 torr has a volume of 37.42 L. What volume will it occupy if the pressure is increased to 894 torr at constant temperature?

Correct Answer
verified

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 Answer
verified

Nitrogen will behave most like an ideal gas

Correct Answer
verified

A sample of propane, a component of LP gas, has a volume of 35.3 L at 315 K and 922 torr. What is its volume at STP?

Correct Answer
verified

For real gases, PV > nRT, always.

Correct Answer
verified

Given that pressure has dimensions of force ÷ area; that force has dimensions of mass × acceleration; and that the S.I. unit of pressure is the pascal, what is 1 pascal in terms of S.I. base units?

Correct Answer
verified

Correct Answer
verified

Calculate the rms speed of carbon dioxide molecules at STP.

Correct Answer
verified

Exam 5: Gases and the Kinetic-Molecular Theory

Select the gas with the highest average kinetic energy per mole at 298 K.

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°C and 89.9 kPa. What is its volume at STP?

Correct AnswerverifiedShow Answer

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 Celsius temperature, other factors remaining constant?

Correct AnswerverifiedShow Answer

According to the postulates of kinetic-molecular theory, the molecules of all gases at a given temperature have the same average kinetic energy.

Correct AnswerverifiedShow Answer

For an ideal gas, a plot of PV/nRT versus P gives a straight line with a positive slope.

Correct AnswerverifiedShow Answer

A flask with a volume of 3.16 L contains 9.33 grams of an unknown gas at 32.0°C and 1.00 atm. What is the molar mass of the gas?

Correct AnswerverifiedShow Answer

"The rate of effusion of a gas is inversely proportional to the square root of its molar mass" is a\ statement of ______________________ Law.

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

A sample of nitrogen gas at 298 K and 745 torr has a volume of 37.42 L. What volume will it occupy if the pressure is increased to 894 torr at constant temperature?

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

Nitrogen will behave most like an ideal gas

Correct AnswerverifiedShow Answer

A sample of propane, a component of LP gas, has a volume of 35.3 L at 315 K and 922 torr. What is its volume at STP?

Correct AnswerverifiedShow Answer

For real gases, PV > nRT, always.

Correct AnswerverifiedShow Answer

Given that pressure has dimensions of force ÷ area; that force has dimensions of mass × acceleration; and that the S.I. unit of pressure is the pascal, what is 1 pascal in terms of S.I. base units?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Calculate the rms speed of carbon dioxide molecules at STP.

Correct AnswerverifiedShow Answer

Correct Answer
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