For each problem below show:
a) Identification of all data
b) Identify formula to be used
c) Isolate the unknown in the equation
d) Show solution using required units
Gas Law
Problem Set
(2 of 2)
The Ideal Gas Law
1) 4.00 L of ammonia gas in a container holds 2.17 mol at 206 kPa. What is the temperature inside the
container?
2) Calculate the volume of 3.03 g of hydrogen gas at a pressure of 560 torr and a temperature of 139 K.
(Hint: 1 torr = 1 mmHg, 760 mmHg = 101.325 kPa)
3) A 6.0 x 102 L reaction tank contains 5.0 mol of oxygen gas and 28 mol of nitrogen gas. If the
temperature is 83 °C, what is the pressure of the oxygen, in kPa.
(Additional Ideal Gas Law Textbook Questions p. 445 Practice UC # 3, 4, 5, 6
Dalton’s Law of Partial Pressures
4) To speed up a reaction in a vessel pressurized at 98.0 kPa, a chemist added 202.65 kPa of hydrogen
gas. What was the resulting pressure?
5) At tank of compressed air for an underwater diver holds nitrogen at a partial pressure of 240 kPa and
has a total pressure of 385 kPa. What is the partial pressure of oxygen in the tank?
6) In an experiment, a student collected a 275 mL sample of hydrogen at 92.4 kPa and 25 °C using the
method of water displacement.
a) What is the partial pressure of hydrogen?
b) What volume would this hydrogen occupy at standard ambient pressure at 100 kPa?
(Additional Dalton’s Law Textbook Questions p. 461 Practice UC #1 and p. 462 Practice UC # 2, 3 and
p. 463 Practice UC # 5, 6 and p. 465 Practice UC # 8, 9
Reactions of Gases
7) What is the volume of 3.0 mol of nitrous oxide, NO2(g), at STP?
8) Suppose that you have 44.8 L of methane gas at STP.
a) How many moles are present?
b) What is the mass (in g) of the gas?
c) How many molecules of gas are present?
9) Ammonia is produced by a reaction of nitrogen gas and hydrogen gas. The chemical equation for the
reaction is N2(g) + 3 H2(g)  2 NH3(g)
Suppose that 12.0 L of nitrogen gas reacts with hydrogen gas at the same temperature and pressure.
a) What volume of ammonia gas is produced?
b) What volume of hydrogen is consumed?
(Additional Reactions of Gases Textbook Questions: p. 468 Practice UC # 3, 4, 5 and
p. 471 Practice UC # 7, 8, 9, 10, 11)
Gas Stoichiometry
10) Plants consume carbon dioxide and gas as they produce sugar during photosynthesis.
6 CO2 + 6 H2O  C6H12O6 + 6O2
To produce 50.0 g of sugar, C6H12O6, how many liters of gas at SATP does a sugar beet need to consume?
11) Ammonia gas reacts with sulfuric acid to form the important fertilizer ammonium sulfate. What mass
of ammonium sulfate can be produced from 84 kL of ammonia at 12°C and 115 kPa?
(Additional Gas StoichiometryTextbook Questions:
p. 483 Practice UC # 1, 2,3 and p. 486 Section 10.4 Questions # 1, 3, 4
1) 45.7 k
2) 23.2 L
3) 25 kPa
4) 300.6 kPa
5) 145 kPa
6) a) 89.2 kPa
b) 245 mL
ANSWERS
7) 67 L
8) a) 2.00 mol
b) 32.1 g
c) 1.20 x 1024
9) 3.26 x103 L
10) 41.3 L
11) 2.6 x 102 kg