GAS LAW WORKSHEET
A.
Mixed Gas Laws, including Ideal Gas Law
1. A certain gas is found to have a density of 0.16 g/ L at 25℃ and 745 torr. What is
mass of the gas?
Ans. 3.98 amu
the molecular
2. 56 grams of nitrogen is introduced into an evacuated 20 liter flask at -73℃. What is the pressure
(a) in atmospheres, and (b) in torr in the container?
Ans. (a) 1.639 atm, (b) 1.246 x 103 torr
3. A gas occupies 68 mL at standard temperature and pressure. What volume will it occupy at 30℃ and
725 torr?
Ans. 79.12 mL
4. A rigid steel cylinder with a volume of 20 L is filled with nitrogen gas to a final pressure of 200 atm at
27℃. How many moles of N2 gas does the cylinder contain?
Ans. 163 moles
5. A gas at 27.0℃ exerts a pressure of 745 torr. What pressure is exerted by the same gas at 0.00℃?
Volume and mass are held constant.
Ans. 678 torr
6. A gas occupies 515 mL at 27℃. What volume will it occupy at standard temperature?
Ans. 468.65 mL
7. A gas measuring 525 mL is collected at 785 torr. What volume does this gas occupy at 745 torr?
Ans. 553 mL
8. The gas left in an used aerosol can is at a pressure of 1 atm at 27℃. If this can is thrown unto a fire,
what is the internal pressure of the gas when its temperature reaches 927℃?
Ans. 4 atm
9. How many moles of argon atoms are present in 11.2 L of argon gas at STP? How many atoms is this?
Ans. 0.5 moles, 3.01 x 1023 atoms
10. How many nitrogen molecules are in 5.62 L of nitrogen gas at STP?
Ans. 1.51 x 1023
11. Determine the volume in liters occupied by 22.6 g of Cl2 gas at STP.
Ans. 7.13 L
12. What is the pressure exerted by 32 g of O2 in a 20-L container at 30.0℃? Ans. 1.24 atm
B. Ideal Gas Laws: Density and Molar Mass
13 The gaseous product of a reaction is collected in a 25.0-L container at 27℃. The pressure in the
container is 3.0 atm and the gas has a mass of 96.0 g. What is the formula mass of the gas?
Ans. 31.488 amu
14. Find the density of carbon dioxide at 40.0℃ and 1 atm pressure.
Ans. 1.714 g/ L
15. An unknown diatomic gas has a density of 3.164 g/L at STP. What is the identity of the gas?
Ans. Cl2
16. Uranium hexafluoride is a solid at room temperature, but it boils at 56℃. Determine the density of
uranium hexafluoride at 60.℃ and 745 torr.
Ans. 12.6 g/L
17. Find the density of oxygen at 17℃ and 740 torr.
Ans. 1.31 g/ L