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Version 029 – hw02 – Holcombe – (53570)1Thisprint-outshouldhave25questions.Multiple-choice questions may continue onthe next column or page – find all choicesbefore 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 benzene2.diethylether3.methanol and diethylether00210.0 pointsWhat is the vapor pressure of carbon disulfideat its normal boiling point?00310.0 pointsThe solubility of a gas such as O2in water(decreases, increases, stays the same) withincreasing temperature.00410.0 pointsAccording 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?
Version 029 – hw02 – Holcombe – (53570)2increasing temperature.Explanation:Gases become more soluble as pressuresincreases and temperatures decrease.00610.0 pointsThe solubility of oxygen at a certain tempera-ture is 8 ppm. If the partial pressure of oxygenis doubled at this temperature, the solubilityis 16 ppm.1.Truecorrect2.FalseExplanation:00710.0 pointsHint: The units for Henry’s constant shouldindicate what form of Henry’s Law to use.Calculate the number of moles of oxygenthat will dissolve in 45 L of water at 20◦Cif the partial pressure of oxygen is 0.21 atm.Henry’s constant for oxygen is 0.0013molL·atm.1.0.0062 mol2.0.012 molcorrect3.0.28 mol4.0.00027 mol5.0.0013 molExplanation:00810.0 pointsWhat is the vapor pressure of the solvent inan aqueous solution of glucose at 80◦C if themole fraction of glucose is 0.09?The vaporpressure of water at 80◦C is 355.26 Torr.