ihm (jhi89) – Homework 3 – holcombe – (51395) 1 This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 0014.0pointsConsider dissolving gases in water. Which ofthe following gases will become less soluble ifthe temperature of the water is raised? 1.all of these2.He 0024.0pointsWhat will be the freezing point of a solutionof 4 moles of sodium dichromate (Na2Cr2O7)dissolved in 8 kg of water? Use the followingvalues:Kb= 0.512 K·m−1Kf= 1.86 K·m−11.271.6 K2.272.2 K3.264.6 K4.269.4 K5.270.2 K0034.0pointsSeveralinterestingobservationsfromtheworld around you are listed below.Whichof these is NOT explained by a colligativeproperty? 3.Antifreeze is added to a car radiator tokeep the car from overheating.4.Water boils at a higher temperature whensalt is added.5.At high altitude it takes longer to cookspaghetti. The colligative effects of 1 molal sugar solu-tion would be? 3.the same as0054.0pointsIf ethylene glycol has a pure vapor pressureof 28 torr and acetaldehyde has a pure vaporpressure of 756 torr A mixture of 6 moles ofethylene glycol and 1 moles of acetaldehydewould have what total vapor pressure?1.132 torr2.108 torr3.672 torr4.24 torr5.112 torr0064.0pointsThevaporpressureofpureacetone(CH3COCH3) at 30oC is 240 torr.The va-por pressure of pure water (H2O) at 30oC is40 torr. If the total vapor pressure of a mix-ture of water and acetone at 30oC is 190 torr,what is the mol fraction of acetone?
ihm (jhi89) – Homework 3 – holcombe – (51395) 2
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- Fall '07
- Chemistry, Vapor pressure, Vapor, Freezing-point depression