This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: CHEM 1007: Optional practice problems for material after prelim 2 Gases 1. Consider a 1.0 L sample of helium gas and a 1.0 L sample of argon gas, both at room temperature and atmospheric pressure. (a) Do atoms in the helium sample have the same average kinetic energy as the atoms in the argon sample? (b) Do the atoms in the helium sample have the same average velocity as the atoms in the argon sample? (c) Do the argon atoms, exert a greater pressure on the walls of the container? (d) Which gas sample would have the fastest rate of effusion? 2. The mass of an evacuated 255 mL flask is 143.187 g. The mass of the flask filled with 267 Torr of an unknown gas at 25 C is 143.289 g. Calculate the molar mass of the unknown gas. 3. A mixture of CO(g) and O 2 (g) in a 1.0 L container at 1000K has a total pressure of 2.2 atm. After some time the total pressure falls to 1.9 atm as the result of the formation of CO 2 (g). Find the amount of CO 2 (g) that forms. 4. A steel container of volume 0.35 L can withstand pressures up to 88 atm before exploding. Find the maximum mass of helium that can be stored in this container at 299K. 5. A mixture of CH 4 (g) and C 2 H 6 (g) has a total pressure of 0.53 atm. Just enough O 2 (g) is added to the mixture to bring about its complete combustion to CO...
View Full Document