kandalam (atk274) – Homework #2 – Holcombe – (51055) 1 This print-out should have 24 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Consider two closed containers. Container X is a 2 L container that contains 0.5 L of acetone. Container Y is a 2 L container that contains 1.8 L of acetone. Both containers and contents are at 30 ◦ C. Which of the following is true? 1. The vapor pressures in both containers are equal. 2. The vapor pressure in container Y is greater. 3. You would need information about the shape of the containers to be able to answer this question. 4. The vapor pressure in container X is greater. 002 10.0 points Which of the following is a restatement of Henry’s Law? 1. Adding a non-volatile solute to a liquid will lower its vapor pressure. 2. As the partial pressure of a gas above a liquid increases, the gas’s solubility in that liquid also increases. 3. Heating a solution will decrease the solu- bility of gases dissolved in it. 4. A mixture of two liquids will have a vapor pressure that isn’t equal to either of the pure liquid’s vapor pressures. 003 10.0 points The vapor pressures of pure carbon disulfide and carbon tetrachloride are 360 and 99.8 torr, respectively, at 296 K. What is the vapor pressure of a solution containing 50.0 g of each compound? 1. 274 torr 2. 460 torr 3. 260 torr 4. 33.0 torr 5. 241 torr 004 10.0 points For gases that do not react chemically with water, the solubility of the gas in water gen- erally (decreases, increases) with an increase in the pressure of the gas and (decreases, in- creases) with increasing temperature. 1. increases; increases 2. decreases; decreases 3. increases; decreases 4. decreases; increases 005 10.0 points The vapor pressure of pure CH 2 Cl 2 (molecu- lar weight = 85 g/mol) is 133 torr at 0 ◦ C and the vapor pressure of pure CH 2 Br 2 (molecu- lar weight 174 g/mol) is 11 torr at the same temperature. What is the total vapor pres- sure of a solution prepared from equal masses of these two substances?
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- Fall '10
- Chemistry, Vapor pressure, 35,000 g, 133 torr, 144 torr, 180 torr