CH 222 – Ziegler Worksheet Gas Laws
1. If a sample of oxygen, O2, occupies 5.00 L at 740. mm Hg pressure, what volume will it occupy at 760. mm Hg?
2. A gas in a sealed container is at 20.°C and 600. mm Hg. What will be the pressure of the gas if the container and gas are heated to 200. °C?
3. Some CO2 gas is in a steel tank at 27°C and 12.0 atm pressure. If the tank is heated to 100.°C, what will the pressure of CO2 in the tank?
4. A sample of the gas, NH3, occupies a volume of 20.0 L at 5°C and 760. mm Hg pressure. What will the volume occupied by the sample be at 30.°C and 800. torr?
5. What is the volume of one mole of and gas at room conditions here in Bend (670. torr, and 25 °C)?
6. What volume will 4.0 g of O2 occupy at 700. mm Hg and 25°C?
7. What is the density of N2 at 50. °C and 700. torr?
8. What is the density of the gas CH4 at 20.°C and 5.00 atm?
9. A gas sample with a mass of 2.71 g occupies 1.29 L at 18°C and 765 mm Hg. What is the molecular weight of the gas?
10. An unknown gas has an empirical formula (also known as a “simplest formula”) of CH2F. If 0.0866 g of the gas occupies a volume of 60.0 mL at 400. mm Hg and 20.°C, what is the molecular formula of the gas?
11. KClO3 can be heated to produce O2 according to the reaction
How many L of O2 at 0.°C and 1.00 atm can be prepared from 100. g of KClO3? (Hint to simplify the calculation: At 0.°C and 1 atm pressure, one mole of gas occupies 22.4 L. Once you know the number of moles of O2 produced, then, since the O2 is at 0.°C and 1 atm pressure, use of the conversion factor ( 22.4 L/mol ) will quickly give the L of O2 produced.)
12. 100. mL of O2, generated by the reaction in #11,was collected over water at 23°C and 800. mm Hg. How many moles of O2 was collected? (The vapor pressure of water at 23°C is 21 mm Hg.)
13. In a steel tank having a volume of 24.5 L are contained: 1.00 moles of O2; 2.00 moles of CO2; and 3.00 moles of N2, all at 25°C. What is the partial pressure of each gas in the tank and what is the total pressure of the gases in the tank? (Hint: Recall that the partial pressure of a gas is that pressure the gas would have if it occupied the container all by itself at the same temperature and pressure.)
14. Three times as many moles of HCl as moles of SF6 are combined in a sealed vessel. The pressure of the vessel is 1.1 atm, and the temperature is 25°C.
a.
What is the mole fraction of
HCl (g) (
) in this mixture?
b.
What is the partial pressure
of SF6 (
)?
c. On average, which type of molecule is moving faster?
d. How much faster is that type of molecule moving, on average?
