Chapter 11 Revision
A) PROBLEMS:
Write the answer on the line to the left. Show all your work in the space provided.
1. Convert a pressure of 0.400 atm to the following units:
_________ a. torr
_________ b. Pa
2. _________________
A 250. mL sample of gas is collected at 57C. What volume will the
gas sample occupy at 25C?
3. _________________
H2 reacts according to the following equation representing the
synthesis of ammonia gas:
N2(g)  3H2(g)  2NH3(g)
If 1 L of H2 is consumed, what volume of ammonia will be
produced at constant temperature and pressure, based on GayLussac’s law of combining volumes?
4. _________________
A 7.00 L sample of argon gas at 420. K exerts a pressure of 625 kPa.
If the gas is compressed to 1.25 L
and the temperature is lowered to 350. K, what will be its new
pressure?
5. _________________ Chlorine in the upper atmosphere can destroy ozone molecules, O3.
The reaction can be represented by the following equation:
Cl2(g)  2O3(g)  2ClO(g)  2O2(g)
How many liters of ozone can be destroyed at 220. K and 5.0
kPa if 200.0 g of chlorine gas react with it?
B) In the space provided, write the letter of the term or phrase that best completes each statement
or best answers each question.
_____ 1. The SI unit of pressure is
a. newtons.
b. pascals.
c. atmospheres.
d. torr.
_____ 2. Most manometers and barometers contain
a. water.
b. alcohol.
c. mercury.
d. oil.
_____ 3. Pressure =
a. force  area
b.
c.
d.
_____ 4. The unit of pressure known as the pascal is equal to
a. 14.700 psi.
b. 760 mm Hg.
c. 1 atm.
d. 1 N/m2 .
_____ 5. Air is about 78% nitrogen, 21% oxygen, and 1% other gases. After all the oxygen is removed
from a sample of air in a glass tube and the temperature remains constant, the pressure
exerted by the remaining air
a. does not change.
b. is reduced by 78%.
c. is reduced by 50%.
d. is reduced by 21%.
_____ 6. Which graph illustrates Boyle’s law?
a. _________________
Volume vs. Pressure
for a Gas at Constant Temperature
b. __________________
Volume Vs. Temperature for a Gas at Constant Pressure
c. __________________
Pressure Vs. Temperature for a Gas at Constant Volume
d. None of the graphs
_____ 7. The law that relates the temperature and volume of a gas to each other is known as
a. Charles’s law.
b. Boyle’s law.
c. Gay-Lussac’s law.
d. Graham’s law.
_____ 8. Gay-Lussac recognized that at constant temperature and pressure, the volumes of gaseous
reactants and products
a. can be expressed as ratios of small whole numbers.
b. add up to 22.4 L.
c. equal R.
d. always equal 1 L.
_____ 9. Which of the following expressions relates the kelvin and Celsius temperature scales?
a. K = 273.15 + °C
b. K = 273.15 + °C
c. °C = 273.15 K
d. K = 273.15°C
_____ 10. At constant temperature and pressure, gas volume is directly proportional to the
a. molar mass of the gas.
b. number of moles of gas.
c. density of the gas at STP.
d. rate of diffusion.
_____ 11. What is the conversion factor that should be used to determine the number of moles of a gas
at STP when you are given the volume
of the gas?
a.
b.
c.
d.
_____ 12. The ratios of the volumes of the gaseous reactants and products in a chemical reaction at
constant temperature and pressure can be determined from the
a. formulas.
b. coefficients in the balanced equation.
c. subscripts in the balanced equation.
d. gas constant.
_____ 13. For the balanced equation 2CO(g) + O2(g)  2CO2(g), the ratio 2:1:2 refers to all the
following except
a. volumes.
b. moles.
c. molecules.
d. pressures.
_____ 14. The law of combining volumes applies only to gas volumes
a. measured at constant temperature and pressure.
b. that equal 1 L.
c. that equal 22.4 L.
d. measured at STP.
_____ 15. According to Avogadro’s law, 1 L of H2(g) and 1 L of O2(g) at the same temperature and
pressure
a. have the same mass.
b. have the same molar mass.
c. contain 1 mol of gas each.
d. contain equal numbers of molecules.
_____ 16. The passage of gas particles through a small opening is called
a. diffusion.
b. pressurization.
c. effusion.
d. vaporization.
_____ 17. Which of these gases effuses the slowest under the same conditions?
a. Ne
b. NH3
c. NO2
d. CO2
_____ 18. In the figure above, the curve that represents an ideal gas is curve
a. A.
b. B.
c. C.
d. D.
_____ 19. Gases tend to deviate from the ideal gas law at
a. high pressures.
b. low pressures.
c. high temperatures.
d. low pressures and high temperatures.
_____ 20. A 10.2-L canister of oxygen gas contains 58.6 mol of gas at a temperature of 25.0°C. What is
the pressure of the gas?
a.
b.
c.
d.
7.11 X 10 3 atm
8.48 X 10 2 atm
11.8 atm
141 atm
_____ 21. Hydrogen gas is collected by water displacement. If the barometric
pressure is 752.0 torr and the water vapor pressure is 17.5 torr, what is the partial pressure of
the hydrogen collected?
a. 769.5 torr
b. 752.0 torr
c. 734.5 torr
d. 17.5 torr
_____ 22. A sample of helium gas has a volume of 250.0 mL when its pressure is 0.935 atm. If the
temperature remains constant, what will the pressure of the gas be when it has a volume of
175.0 mL?
a. 1.34 atm
b. 1.00 atm
c. 0.935 atm
d. 0.654 atm
_____ 23. You collect 552 mL of argon gas at 23.0°C. What volume will the gas occupy at 46.0°C if
the pressure remains constant?
a. 276 mL
b. 512 mL
c. 595 mL
d. 1104 mL
_____ 24. The gas in an aerosol container is at a pressure of 3.50 atm at 24.0°C. The caution on the
container warns against storing it at temperatures above 95°C. What would the gas pressure
in the container be at 95°C?
a. 4.34 atm
b. 8.68 atm
c. 13.9 atm
d. 84.0 atm
_____ 25. What is the ratio of the rate of effusion of helium (atomic mass
4.00 amu) to that of oxygen gas (molecular mass 32.0 amu)?
a. 0.125
b. 0.354
c. 2.83
d. 8.00