CH302 Holcombe Hwk #2 - perlick(app582 Homework#2 holcombe(51160 This print-out should have 22 questions Multiple-choice questions may continue on the

CH302 Holcombe Hwk #2 - perlick(app582 Homework#2...

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perlick (app582) – Homework #2 – holcombe – (51160) 1 This print-out should have 22 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points Consider two closed containers.ContainerX is a 2 L container that contains 0.5 L ofacetone. Container Y is a 2 L container thatcontains 1.8 L of acetone. Both containers andcontents are at 30C. Which of the followingis true? 1.The vapor pressure in container X isgreater. 2.You would need information about theshape of the containers to be able to answerthis question. correct 4.The vapor pressure in container Y isgreater.Explanation:00210.0pointsWhich of the following is a restatement ofHenry’s Law? 1.As the partial pressure of a gas above aliquid increases, the gas’s solubility in thatliquid also increases. correct 2. Adding a non-volatile solute to a liquid will lower its vapor pressure. 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. Explanation: Henry’s law, formulated by William Henry is 1803 states: ”At a constant temperature, the amount of a given gas dissolved in a given type and volume of liquid is directly propor- tional to the partial pressure of that gas in equilibrium with that liquid.” 003 10.0points The vapor pressures of pure carbon disulfideand carbon tetrachloride are 360 and 99.8torr, respectively, at 296 K. What is the vaporpressure of a solution containing 50.0 g of eachcompound? Explanation: 004 10.0points For gases that do not react chemically withwater, the solubility of the gas in water gen-erally (decreases, increases) with an increasein the pressure of the gas and (decreases, in-creases) with increasing temperature. 2. increases; decreases correct 3. decreases; increases 4. increases; increases Explanation: An increase in pressure means that you have increased the concentration of gas above the solvent surface, thereby increasing the concentration of the gas in the solvent. In- creasing the temperature will decrease the solubility of the gas. 005 10.0points 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-
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perlick (app582) – Homework #2 – holcombe – (51160)
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