Honor Chemistry - Gas Laws Review
1)
Suppose a 25.2 mL sample of helium gas at 29oC is heated to 151oC. Keeping the pressure constant,
what will it be the new volume occupied by the helium gas?
2)
A sample of hydrogen gas occupies 3.00 L at 1.15 atm. What pressure would this sample of gas exert in
a 1.85 L container at the same temperature?
3)
A sample of chlorine gas occupies 1.00 L at 26.0C and 1.00 atm. If the temperature is increased to
50.0C and the volume reduced to 0.50L, what is the final gas pressure?
4)
You fill up a balloon with air to a volume of 4.00 L at 25.0C and a pressure of 101.3 kPa. The balloon
is then submerged in a tank of water under a pressure of 205.1 kPa and a temperature of 5.00C.
Calculate the final volume of the balloon.
5)
A gas occupies 100. L at 1.5 atm pressure and 25.0°C.
a) How many moles of the gas are present in the sample?
b) If the mass of the gas is measured to be approximately 172. grams, the identity of the gas is:
(A) H2
(B) He
C) CH4
(D) N2
(E) O2
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6)
How many moles of sulfur dioxide gas are present in a 10 L sample at 5.0oC and 117 kPa?
How many grams of the gas are in the container?
7) 5.00 g of water evaporates into a bag. The final volume of the bag is about 3.00 L at 298 K. What is the
pressure of the water vapor in the bag?
8)
What is the density of fluorine gas at 25oC and 775 mmHg?
9)
What is the molar mass of 4.76 g of a gas that occupies 2.3L at 1900 mmHg pressure and 23oC?
The identity of the gas is: (A) H2
(B) He
C) Ne
(D) Ar
10) Ammonia gas (NH3) is produced by the following reaction: ____N2(g) + ____H2(g)  ____NH3(g)
How many liters of H2 are needed to react completely with 52.0 L of N2 at STP conditions?
How many liters of NH3 are produced with 52.0 L of N2 at STP conditions?
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11) Consider the following reaction 4Al (s) + 3O2 (g)  2Al2O3 (s). What volume of O2 gas at STP would
be needed to react completely with 1.55g Al?
12) Magnesium metal reacts with chlorine gas forming magnesium chloride according to the following
reaction: Mg(s) + Cl2(g)  MgCl2(s)
What volume of Cl2 gas would be needed to react completely with 3.02 g of Mg at 21oC and 1.03 atm?
13) A sample of O2 is collected over water at 27oC. The total pressure of the mixture is 772 mmHg.
a) What is the partial pressure of the oxygen gas?
b) If the volume occupied by the gas is 18.0 ml, how many moles and grams of gas were collected?
14) If 20mL of hydrogen is collected over water at 20oC and 760mmHg, how many moles and grams of the
gas were collected?
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15) A 2.6 L rigid container is filled with a gas mixture which is composed of 70% CH4 and 30% C2H6.
(a) Determine the partial pressure that each gas exerts on the container if the total pressure is 202.6 kPa.
(b) Calculate the total mass of the gas mixture if the container internal temperature is 50.0ºC.
16) Two flasks are connected with a stopcock as shown on the diagram below.
The first flask has a volume of 3.5 L and contains nitrogen gas at a pressure of 2.40 atm. The second
flask has a volume of 7.0 L and contains oxygen gas at a pressure of 1.80 atm. When the stopcock is
opened and the gases are free to mix, what will the pressure be in the resulting gas mixture? Assume
temperature remains constant.
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