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alex chem hw - Version 063 hw02 Holcombe(53570 This...

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Version 063 – hw02 – Holcombe – (53570) 1 This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points At 75 , the vapor pressure of water, methanol, diethylether and benzene are 289, 1126, 2680, and 644 torr, respectively. Which of these is NOT above its boiling point at normal atmo- spheric pressure? 1. methanol, diethylether, and benzene 2. diethylether 3. None of these 4. water 5. methanol and diethylether 6. water and benzene 002 10.0 points What is the vapor pressure of carbon disulfide at its normal boiling point? 1. 0.5 atm 2. 2.0 atm 3. 2.5 atm 4. 1.2 atm 5. 0.3 atm 6. 1.0 atm 003 10.0 points The solubility of a gas such as O 2 in water (decreases, increases, stays the same) with increasing temperature. 1. increases 2. stays the same 3. decreases 004 10.0 points According to Henry’s Law, the concentration of gas dissolved in water has what relationship to the pressure of the gas? 1. proportional to 2. inversely proportional to 3. independent of 4. exponentially dependent on 005 10.0 points Which of the following is a FALSE state- ment? 1. The solubility of a gas decreases with in- creasing temperature. 2. The solubility of a gas depends both on temperature and pressure. 3. The solubility of a gas decreases with in- creasing pressure of a gas above the solution. 4. The solubility of a gas increases with in- creasing pressure of the gas above the solu- tion. 006 10.0 points The solubility of oxygen at a certain tempera- ture is 8 ppm. If the partial pressure of oxygen is doubled at this temperature, the solubility is 16 ppm. 1. False 2. True 007 10.0 points Hint: The units for Henry’s constant should indicate what form of Henry’s Law to use.
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