Chem 1405 Chapter 12 practice problems Mozaffari 1. Perform the following conversions:
a. 0.357 atm to torr
d. 6.60 x10 -2torr to atm
b. 802 mmHg to atm
e. 32 psi to atm
c. 1520 mmHg to atm
f. 367 torr to in.Hg
2. Some aerosol spray cans will explode if their internal pressure exceeds 3.0 atm. If an aerosol can
has a pressure of 2.2 atm at 24 â—‹C, at what temperature will it explode?
3. Volume of a cylinder is 28500f3at 15 â—‹C. What would be the new volume is the temperature is
raised to 31 â—‹C?
4. What volume in Cm3would 2.4 x 10-4mole of a gas occupy at 19 â—‹C, and 1.9 atm?
5. Calculate the density of a gas with a molar mass of 28.6 g/mole at 95 K, and 1.6 atm.
6. A 10-L container holding 2.0 g of H2, and 8 g of N2 gas at 0 â—‹C. Calculate the total pressure.
7. A gas mixture of N2, He, and Ar containing 82 mole percent N2, 12 mole percent Ar, and 6 mole percent He. The total pressure is 1220 torr. Calculate the partial pressure of each
gas in the mixture.
8. Calculate the densities of the following gases at STP, and arrange them in the order of increasing
densities. CO2 He
Cl2 CO CH4 N2
9. Perform the following calculations:
a. The density of SO3(g) at 0.96 atm, and 35 â—‹C
b. The density of SO3(g) at STP
c. Molar mass of a gas if its density is 3.6 g/L at 15 â—‹C and 825 torr
10. Consider the following reaction of ammonia gas and oxygen gas at 850 â—‹C, and 5.0 atm.
4NH3(g) + 5 O2(g)--------------- 4NO(g) + 6H2O(l)
a. How many liters of ammonia gas at 850 â—‹C and 5.0 atm are required to react with 1.0 mole of
oxygen gas in this reaction?
b. How many moles of NO(g) can be prepared using 450 L of ammonia gas at a pressure of 5.00
atm and a temperature of 95 K?
c. How many grams of ammonia gas are needed to generate 10 L of NO gas if pressure of NO
gas is 740 torr at 23 â—‹C?
11. An air bubble forms at the bottom of a lake, where the total pressure 2.45 atm. At this pressure
the volume is 3.1 mL. What volume, in mL, will it have when it rises to the surface, where the
pressure is 0.93 atm?
12. A helium-filled birthday balloon has a volume of 223 mL at a temperature of 24 â—‹C. The balloon is
placed in a car overnight during the winter where the temperature drops to -13 â—‹C. What is the
new volume when the balloon is removed from the car?
13. A pressurized can of shaving cream contains a gas under an internal pressure 1.065 atm at 24 â—‹C.
The can itself is able to withstand an internal pressure of 3.00 atm before it explodes. What
temperature, in degrees Celsius, is needed to A elevate the internal pressure within the can to its
maximum value?
14. A sample of helium gas occupies a volume of 180.0 mL at a pressure of 0.800 atm and a
temperature of 29 â—‹C. What will be the temperature of the gas, in degrees Celsius, if the volume
of the container is decreased to 90.0 mL, and the pressure is increased to 1.6 atm?
15. A balloon containing 2.00 moles of He has a volume of 0.500 L. If 0.48 mol of He gas is removed
from the balloon, what will be the new volume? 16. A 3.30 g sample of chlorine gas (Cl2) occupies a volume of 1.20 L at 741 mmHg and 33 â—‹C. Based
on this data, calculate the molar mass of Cl2 gas.
17. A gaseous mixture of 3.00 g of N2 and 7.00 g of Ne. What is the volume, in liters, occupied by this
mixture, if it is under a pressure of 2.00 atm and a temperature of 27 â—‹C?
18. A gaseous mixture contains 10.0 g each of the gases N 2, O2, and Ar. What is the mole fraction of
each gas in the mixture?
19. What is the partial pressure of oxygen gas collected over at 17 â—‹C on a day when the barometric
pressure is 743 mmHg?
20. A 17.92 L flask, at STP, contains 0.20 mole of O 2, 0.30 mole of N2, and 0.30 mole of Ar. For this
gaseous mixture, calculate the:
a. Mole percent of O2
b. pressure percent of O2
c. volume percent of O2

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