Name:

1. The pressure of a gas is 440 mm Hg. Express this pressure in units of:

    atm

    kPa 

2. A sample of nitrogen gas has a pressure of 67.5 mm Hg in a 500. mL flask. What is the pressure 
    of this gas when it is transferred to a 125 mL flask at the same temperature?

3. One of the cylinders of of an automobile engine has a volume of 400. ml. The engine takes in 
    air at a pressure of 1.00 atm and a temperature of 15 ^oC and compresses the air to a volume of 
    50.0 ml at 77 ^oC. What is the pressure inside the cylinder?

4. Nitrogen monoxide reacts with oxygen to give nitrogen dioxide.

    (a) Write the balanced chemical equation

    (b) If you mix NO and O₂ in the correct stoichiometric ratio, and NO has a volume of 150 ml,
         what volume of O₂ is required (at the same temperature and pressure)   

    (c) After the  reaction is complete between 150 ml of NO and the stoichiometric volume
         of O₂, what is the volume of NO₂?

5. A flask is first evacuated so that it contains no gas at all. Then 2.2 grams of CO₂ is introduced
    into the flask. On warming to 22 ^oC, the gas exerts a pressure of 318 mm Hg. What is the 
    volume of the flask?

6. A gaseous organofluoriine compound has a density of 0.355 g/L at 17^oC and 189 mm Hg. What 
    is the molar mass of the compound?

7. A person wakes up early in the morning and steps out on to the balcony of her hotel at Myrtle
     Beach. With a stretch of the arms, she says, "Ahhh, a breath of sea air!" If a breath of air
     is 2.4 L at body temperature (28.0 ^oC), how many molecules of oxygen are there in that
    "breath of fresh air?" (Air is 21% oxygen by volume.)
    

8. A 1.007 gram sample of an unknown gas exerts a pressure of 715 mm Hg in a 452 ml container
    at 23 ^oC. What is the molar mass of the gas?

9. Iron reacts with hydrochloric acid to produce iron(II) chloride and hydrogen gas.

    (a) Write the chemical reaction

    (b) If 2.2 grams of iron reacts with an excess of acid and the hydrogen gas is collected in a 10.0
         L flask at 25 ^oC, what is the pressure of H₂ inside the flask?

10. Sodium azide, the compound used in airbags decomposes according to the equation
     NaN₃(s)  --> 2Na(s)  +  3N₂(g). What mass of sodium azide is required to provide the nitrogen
     needed to inflate a 75.0 L bag to a pressure of 1.3 atm at 25 ^oC?

11. What is the total pressure in atmospheres of a gas mixture that contains 1.0 g of H₂, and
     8.0 g of Ar in a 3.0 L container at 27 oC? What are the partial pressures of each gas?
        

12. You have two flasks of equal volume. Flask A contains H₂ at 0 ^oC and 1 atm. Flask B contains
      CO₂ gas at 25 ^oC and 2 atm pressure. Compare these two gases with respect to:
       (a) Average kinetic energy per molecule
       (b) Average molecular velocity
       (c) Number of molecules
       (d) Mass of gas

13. If the average speed of an oxygen molecule is 4.28 x 10⁵ cm/s, what is the average speed of a
     CO₂ molecule at the same temperature?

14. In each of the following pairs of gases, determine which one will effuse faster than the other.
      (a) CO₂ or F₂
      (b) O₂ or N₂
      (c) C₂H₄ or C₂H₆

15. Ni(CO)₄ can be made by reacting finely divided nickel with gaseous CO in a synthesis reaction.
     If you have CO in a 1.50 L flask at a pressure of 418 mm Hg at 25.0 ^oC, along with 0.450 g of
     Ni powder, what is the theoretical yield of Ni(CO)₄?

16. Analysis of gaseous chloroflorocarbon, CCl_xF_y, shows that it contains 11.79% C and 69.57%
     Cl and the rest F. In another experiment you find that 0.107 g of the compound fills a 458 ml
     flask at 25 ^oC with a pressure of 21.3 mm Hg. What is the molecular formula of the compound?