Question 1

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

Question 2

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. 
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 3

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

Question 4

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. 
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 5

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

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

For real gases, PV > nRT, always.

Accepted Answer

A) True 
 B)False

Question 8

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 
A)  21.8 L 
B)  27.6 L 
C)  29.6 L 
D)  37.6 L 
E)  153 L

Question 9

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 
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 10

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 
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 11

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

Question 12

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 13

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. 
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 14

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

Question 15

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

Question 16

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

Question 17

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. 
A)  75 torr 
B)  100. torr 
C)  150. torr 
D)  200. torr 
E)  None of these choices are correct.

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?

Calculate the rms speed of carbon dioxide molecules at STP.

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

Nitrogen will behave most like an ideal gas

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

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

For real gases, PV > nRT, always.

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?

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?

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?

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

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.

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?

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?

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?

Keys to Studying Chemistry Definitions, Units, and Problem Solving

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Thermochemistry Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces Liquids, Solids, and Phase Changes

The Properties of Mixtures Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics Rates and Mechanisms of Chemical Reactions

Equilibrium the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics Entropy, Free Energy, and Reaction Direction

Electrochemistry Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Exam 5: Gases and the Kinetic-Molecular Theory

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?

Calculate the rms speed of carbon dioxide molecules at STP.

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

Nitrogen will behave most like an ideal gas

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

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

For real gases, PV > nRT, always.

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?

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?

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?

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

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.

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?

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?

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?

Keys to Studying Chemistry Definitions, Units, and Problem Solving

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Thermochemistry Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces Liquids, Solids, and Phase Changes

The Properties of Mixtures Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics Rates and Mechanisms of Chemical Reactions

Equilibrium the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics Entropy, Free Energy, and Reaction Direction

Electrochemistry Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters