1. Problem Sheet(Gases)
PC 102(Fall 2014)
1- A sample of a gas occupies 15 L under a pressure of 2.1 atm. What would be its
volume if the pressure was increased to 4.2 atm?
2- 4.35 L of a gas is at 1.16 atm. What pressure is obtained when the volume is
9.3 L?
3- A gas is collected and found to fill 4.73 L at 35.0°C. What will be its volume at
standard temperature?
4- A balloon contains 4 moles of an ideal gas with a volume of 5.0 L.
If an additional 8 moles of the gas is added at constant pressure and temperature,
what will be the final volume of the balloon?
5- 2.00 moles of a gas are contained in a 2.00 liter vessel at a temperature of
300 degrees Celsius at a pressure of 10.00 atm. The gas is allowed to expand to a
new volume of 8.00 liters, but at the same time maintaining the original
temperature. What is the new pressure?
6- If 3.0 L of helium at 20.0°C is allowed to expand to 4.4 L, with the pressure
remaining the same, what is the new temperature in °C?
7- At what pressure will 0.75 mol of N2(g) occupy 20.0 L at 50oC?
8- How many moles are there in a sample of an ideal gas at 12 °C occupying a
volume of 4.3 L at a pressure of 3.3atm?
9- The temperature of a sample of an ideal gas in a sealed 5.0 L container is raised
from 27 °C to 77 °C. If the initial pressure of the gas was 3.0 atm, what is the final
pressure?
10- What is the volume in litre occupied by 48.0 g of NH3(g) at STP?
11- How many moles of CO are present in 200 ml sample of CO(g) collected at
100oC and 2.5 atm?

2. 12- What volume will 18.0 g of NH3(g) occupy at 30oC and 2.35 atm?
13- A 250 mL sample of Argon exerts a pressure of 1.03 atm at 40°C. At what
temperature in °K would it exert a pressure of 2.24 atm in a volume of 0.310L?
14- What is the density of CO2 (g) at 100oC and 1.15 atm?
15- What is the density (in g/L) of a gas with a molar mass of 60 g/mol at 0.75 atm
and 27 °C?
16- If a mixture of 15 moles of O2 and 10 moles of N2 has a total pressure of
2.01 atm, what will be the partial pressure of each gas?
17- A mixture of helium and neon gases is held in a container at 1.2 atmospheres. If
the mixture contains twice as many helium atoms as neon atoms, what is the
partial pressure of helium?
18- A sample of air has the following partial pressure of components, 593.4 mm Hg
N2, 159.2 mm Hg O2, 7.1 mm Hg Ar and 0.3 mm Hg CO2. What is the
composition of air in mole fraction?