NVCC AL Campus CHM 111 Worksheet
Chapter 5: Gases
Q1.
Name: Key
Complete the following table. Show your work clearly.
mm Hg or Torr
atm
625
.0198
1.14
Q2. Complete the following table. Show your work.
P
1.025 atm
825 torr
V
n
T
45.2 L
0.0255
- 35°C
325 ml
26°C
1.325
298 K
NVCC AL Campus CHM 111 Worksheet
Q3.
A gas at 750 torr has a volume of 520 L. What is the volume of the gas when its pressure drops to 435 torr if the
temperature does not change? 9.0 x 102 L
Q4.
The volume of a gas is 50.0 L at 20. ◦C and 742 mm Hg. What volume will it occupy at STP? 45.5 L
Q5.
A gas inside a balloon of volume 12.3 m3 is heated from 25◦C to 125 ◦C while its pressure is kept constant. What is the
new volume of the balloon? 16.4 m3
Q6.
A sample of a gas occupying a volume of 150. L at a pressure of 750. torr and a temperature of 12 ºC is expanded to a
volume of 200. L and a pressure of 730. torr. What was the final temperature of the gas in ºC ? 96.9⁰C
NVCC AL Campus CHM 111 Worksheet
Q7.
What is the mass of 120. L of CO2 gas at STP? 236 g
Q8.
Calculate the density in g/L of Sulfur dioxide gas at 730 mm Hg and 40.0 ºC. 2.40 g/L
Q9.
At STP, 9.15 g sample of a gas occupies a volume of 6.82 L. Calculate its molar mass. 30.1 g/mole
NVCC AL Campus CHM 111 Worksheet
Q10.
A mixture of 8.0 g CH4 and 8.0 g Xenon is placed in a 5.0 L container at 25°C. What is the partial pressure of each gas?
What is the total pressure of the container? 2.74 atm
Q11. Consider the following reaction
4 NH3 (g) + 5 O2 (g) → 6 H2O (g) + 4 NO (g)
What volume of O2 at STP is needed to react with 500 L NH3? 625 L
NVCC AL Campus CHM 111 Worksheet
Q12.
A 1.50 L flask contains 50.0 g of Oxygen gas and 50.0 g of CH4 (methane) at a temperature of 225˚C. Calculate the
partial pressure of each of the gases in the flask. What is the total pressure of the mixture? PT = 128 atm
Q13.
Magnesium reacts with Hydrochloric acid as follows
Mg (s) + HCl (aq) → MgCl2 (aq) + H2 (g)
A student collected 25.35 ml of Hydrogen gas over water at 20.0 ºC. The total barometric pressure was found to be 754
torr. How many grams of Magnesium had to react to produce the Hydrogen that was collected? VP of H2O at this Temp
is 17.5 torr.
0.0248 g Mg
NVCC AL Campus CHM 111 Worksheet
Q14. Which gas has the greater average Kinetic Energy: O2 at 200.0 Torr and 373 K or Cl2 at 450.0 Torr and 373 K? Why?
same
Q15.
An unknown diatomic gas has a density of 1.70 g/L at STP. What is the identity of the gas? MM = 38g/mole
Q16.
Arrange the following gases in order of increasing velocity at 25.0 ºC: O2, CH4, NH3, SO2. Heavest to lightest.