Chemistry HW 2 - Version 029 hw02 Holcombe(53570 This print-out should have 25 questions Multiple-choice questions may continue on the next column or

Chemistry HW 2 - Version 029 hw02 Holcombe(53570 This...

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Version 029 – 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. 00110.0 pointsAt 75, the vapor pressure of water, methanol,diethylether and benzene are 289, 1126, 2680,and 644 torr, respectively. Which of these isNOT above its boiling point at normal atmo-spheric pressure? 1.methanol, diethylether, and benzene 2. diethylether 3. methanol and diethylether 002 10.0 points What is the vapor pressure of carbon disulfideat its normal boiling point? 003 10.0 points The solubility of a gas such as O2in water(decreases, increases, stays the same) withincreasing temperature. 004 10.0 points According to Henry’s Law, the concentrationof gas dissolved in water has what relationshipto the pressure of the gas? 00510.0 pointsWhich of the following is a FALSE state-ment?
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Version 029 – hw02 – Holcombe – (53570) 2 increasing temperature. Explanation: Gases become more soluble as pressures increases and temperatures decrease. 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. True correct 2. False Explanation: 007 10.0 points Hint: The units for Henry’s constant should indicate what form of Henry’s Law to use. Calculate the number of moles of oxygen that will dissolve in 45 L of water at 20 C if the partial pressure of oxygen is 0.21 atm. Henry’s constant for oxygen is 0.0013 mol L · atm . 1. 0.0062 mol 2. 0.012 mol correct 3. 0.28 mol 4. 0.00027 mol 5. 0.0013 mol Explanation: 008 10.0 points What is the vapor pressure of the solvent in an aqueous solution of glucose at 80 C if the mole fraction of glucose is 0 . 09? The vapor pressure of water at 80 C is 355 . 26 Torr.
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