Question 1

at 300. K?

Accepted Answer

A)  37.5 K 
B)  75 K 
C)  106 K 
D)  292 K 
E)  2400. K 
A)  37.5 K 
B)  75 K 
C)  106 K 
D)  292 K 
E)  2400. K

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 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 3

The air pressure in a volleyball is 75 psi. What is this pressure in torr?

Accepted Answer

A)  520 torr 
B)  562 torr 
C)  3900 torr 
D)  7600 torr 
E)  75000 torr 
A)  520 torr 
B)  562 torr 
C)  3900 torr 
D)  7600 torr 
E)  75000 torr

Question 4

If the molecular mass of a gas increases by a factor of 4 at constant temperature, its rms speed will

Accepted Answer

A)  decrease by a factor of 4. 
B)  increase by a factor of 4. 
C)  decrease by a factor of 16. 
D)  increase by a factor of 16. 
E)  decrease by a factor of 2. 
A)  decrease by a factor of 4. 
B)  increase by a factor of 4. 
C)  decrease by a factor of 16. 
D)  increase by a factor of 16. 
E)  decrease by a factor of 2.

Question 5

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 6

State Boyle's Law and illustrate it with a graph, using standard x-y coordinate axes. Be sure to label the axes unambiguously with the correct gas variables.

Accepted Answer

At constant temperature, the volume of a

Question 7

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 8

A sample of carbon dioxide gas at 125$\degree$C and 248 torr occupies a volume of 275 L. What will the gas pressure be if the volume is increased to 321 L at 125$\degree$C?

Accepted Answer

A)  212 torr 
B)  289 torr 
C)  356 torr 
D)  441 torr 
E)  359 torr 
A)  212 torr 
B)  289 torr 
C)  356 torr 
D)  441 torr 
E)  359 torr

Question 9

Ima Chemist found the density of Freon-11 (CFCl3) to be 5.58 g/L under her experimental conditions. Her measurements showed that the density of an unknown gas was 4.38 g/L under the same conditions. What is the molar mass of the unknown?

Accepted Answer

A)  96.7 g/mol 
B)  108 g/mol 
C)  127 g/mol 
D)  165 g/mol 
E)  175 g/mol 
A)  96.7 g/mol 
B)  108 g/mol 
C)  127 g/mol 
D)  165 g/mol 
E)  175 g/mol

Question 10

Linolenic acid (C18H30O2) can be hydrogenated to stearic acid by reacting it with hydrogen gas according to the equation: 
C18H30O2 + 3H2 $\rightarrow$C18H36O2 
What volume of hydrogen gas, measured at STP, is required to react with 10.5 g of linolenic acid in this reaction?

Accepted Answer

A)  2.53 L 
B)  1.69 L 
C)  1.27 L 
D)  845 mL 
E)  422 mL 
A)  2.53 L 
B)  1.69 L 
C)  1.27 L 
D)  845 mL 
E)  422 mL

Question 11

A 0.850-mole sample of nitrous oxide, a gas used as an anesthetic by dentists, has a volume of 20.46 L at 123$\degree$C and 1.35 atm. What would be its volume at 468$\degree$C and 1.35 atm?

Accepted Answer

A)  5.38 L 
B)  10.9 L 
C)  19.0 L 
D)  38.3 L 
E)  77.9 L 
A)  5.38 L 
B)  10.9 L 
C)  19.0 L 
D)  38.3 L 
E)  77.9 L

Question 12

A sample of the inert gas krypton has its pressure tripled while its temperature remained constant. If the original volume is 12 L, what is the final volume?

Accepted Answer

A)  4.0 L 
B)  6.0 L 
C)  9 L 
D)  36 L 
E)  48 L 
A)  4.0 L 
B)  6.0 L 
C)  9 L 
D)  36 L 
E)  48 L

Question 13

A 500-mL sample of argon at 800 torr has its absolute temperature quadrupled. If the volume remains unchanged what is the new pressure?

Accepted Answer

A)  200 torr 
B)  400 torr 
C)  800 torr 
D)  2400 torr 
E)  3200 torr 
A)  200 torr 
B)  400 torr 
C)  800 torr 
D)  2400 torr 
E)  3200 torr

Question 14

The temperature of the carbon dioxide atmosphere near the surface of Venus is 475$\degree$C. Calculate the average kinetic energy per mole of carbon dioxide molecules on Venus.

Accepted Answer

A)  2520 J/mol 
B)  4150 J/mol 
C)  5920 J/mol 
D)  9330 J/mol 
E)  5920 kJ/mol 
A)  2520 J/mol 
B)  4150 J/mol 
C)  5920 J/mol 
D)  9330 J/mol 
E)  5920 kJ/mol

Question 15

Which of the following gases effuses most rapidly?

Accepted Answer

A)  nitrogen 
B)  oxygen 
C)  hydrogen chloride 
D)  ammonia 
E)  carbon monoxide 
A)  nitrogen 
B)  oxygen 
C)  hydrogen chloride 
D)  ammonia 
E)  carbon monoxide

Question 16

The pressure of hydrogen sulfide gas in a container is 35,650 Pa. What is this pressure in torr?

Accepted Answer

A)  46.91 torr 
B)  267.4 torr 
C)  351.8 torr 
D)  3612 torr 
E)  27090 torr 
A)  46.91 torr 
B)  267.4 torr 
C)  351.8 torr 
D)  3612 torr 
E)  27090 torr

Question 17

According to the postulates of kinetic-molecular theory, the average kinetic energy of gas molecules is proportional to the absolute temperature.

Accepted Answer

A) True 
 B)False

Question 18

Select the gas with the largest root-mean-square molecular speed at 25$\degree$C.

Accepted Answer

A)  NH3 
B)  CO 
C)  H2 
D)  SF6 
E)  All the gases have the same root-mean-square molecular speed at 25$\degree$C. 
A)  NH3 
B)  CO 
C)  H2 
D)  SF6 
E)  All the gases have the same root-mean-square molecular speed at 25$\degree$C.

Question 19

What are the conditions of STP?

Accepted Answer

A)  0 K and l atm 
B)  273.15 K and 760 torr 
C)  0$\degree$C and 760 atm 
D)  273.15$\degree$C and 760 torr 
E)  None of these choices is correct. 
A)  0 K and l atm 
B)  273.15 K and 760 torr 
C)  0$\degree$C and 760 atm 
D)  273.15$\degree$C and 760 torr 
E)  None of these choices is correct.

Question 20

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

Accepted Answer

A) True 
 B)False

Exam 5: Gases and the Kinetic-Molecular Theory

at 300. K?

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?

The air pressure in a volleyball is 75 psi. What is this pressure in torr?

If the molecular mass of a gas increases by a factor of 4 at constant temperature, its rms speed will

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?

State Boyle's Law and illustrate it with a graph, using standard x-y coordinate axes. Be sure to label the axes unambiguously with the correct gas variables.

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?

A sample of carbon dioxide gas at 125 °\degree° C and 248 torr occupies a volume of 275 L. What will the gas pressure be if the volume is increased to 321 L at 125 °\degree° C?

Ima Chemist found the density of Freon-11 (CFCl3) to be 5.58 g/L under her experimental conditions. Her measurements showed that the density of an unknown gas was 4.38 g/L under the same conditions. What is the molar mass of the unknown?

Linolenic acid (C18H30O2) can be hydrogenated to stearic acid by reacting it with hydrogen gas according to the equation: C18H30O2 + 3H2 →\rightarrow→ C18H36O2 What volume of hydrogen gas, measured at STP, is required to react with 10.5 g of linolenic acid in this reaction?

A 0.850-mole sample of nitrous oxide, a gas used as an anesthetic by dentists, has a volume of 20.46 L at 123 °\degree° C and 1.35 atm. What would be its volume at 468 °\degree° C and 1.35 atm?

A sample of the inert gas krypton has its pressure tripled while its temperature remained constant. If the original volume is 12 L, what is the final volume?

A 500-mL sample of argon at 800 torr has its absolute temperature quadrupled. If the volume remains unchanged what is the new pressure?

The temperature of the carbon dioxide atmosphere near the surface of Venus is 475 °\degree° C. Calculate the average kinetic energy per mole of carbon dioxide molecules on Venus.

Which of the following gases effuses most rapidly?

The pressure of hydrogen sulfide gas in a container is 35,650 Pa. What is this pressure in torr?

According to the postulates of kinetic-molecular theory, the average kinetic energy of gas molecules is proportional to the absolute temperature.

Select the gas with the largest root-mean-square molecular speed at 25 °\degree° C.

What are the conditions of STP?

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

Keys to the Study of Chemistry

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 the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

A sample of carbon dioxide gas at 125 $\degree$ C and 248 torr occupies a volume of 275 L. What will the gas pressure be if the volume is increased to 321 L at 125 $\degree$ C?

Ima Chemist found the density of Freon-11 (CFCl₃) to be 5.58 g/L under her experimental conditions. Her measurements showed that the density of an unknown gas was 4.38 g/L under the same conditions. What is the molar mass of the unknown?

A 0.850-mole sample of nitrous oxide, a gas used as an anesthetic by dentists, has a volume of 20.46 L at 123 $\degree$ C and 1.35 atm. What would be its volume at 468 $\degree$ C and 1.35 atm?

The temperature of the carbon dioxide atmosphere near the surface of Venus is 475 $\degree$ C. Calculate the average kinetic energy per mole of carbon dioxide molecules on Venus.

Select the gas with the largest root-mean-square molecular speed at 25 $\degree$ C.