kamalska (mk23835) – HW02 – Quigley – (104001)1Thisprint-outshouldhave30questions.Multiple-choice questions may continue onthe next column or page – find all choicesbefore answering.00110.0 pointsWhat is the maximum possible value of thevan’t Hoff factor for a solution of the strongelectrolyte FeCl3that is so dilute that no ionassociation occur?1.i= 22.imust be an odd number.3.i= 04.i= 65.i= 4002(part 1 of 3) 10.0 pointsFor the next three questions, consider thefollowing pressure diagram for a binary liquidcontaining A and B.01xA90 torr60 torrIf 1760 g of A (110 g/mol) and 1995 g ofB (105 g/mol) are mixed, what is the vaporpressure of B?1.27 torr2.48 torr3.76 torr4.90 torr5.60 torr003(part 2 of 3) 10.0 pointsWhat is the corresponding vapor pressure ofA?1.90 torr2.27 torr3.60 torr4.48 torr5.76 torr004(part 3 of 3) 10.0 pointsWhat is the corresponding total vapor pres-sure?1.90 torr2.60 torr3.48 torr4.76 torr5.27 torr00510.0 pointsChemical processes, like dissolving solids, arefavored by (decreased, increased) potentialenergy and (decreased, increased, unchanged)disorder.1.increased; increased2.decreased; decreased3.increased; decreased4.decreased; increased5.increased; unchanged00610.0 pointsA well-behaved (non-volatile, non-ionic) so-lute is dissolved in water to yield a solutionthat freezes at-0.930◦C. At what temper-ature would this solution boil under 1.0000atm pressure?Note thatKf= 1.86◦C/m,
kamalska (mk23835) – HW02 – Quigley – (104001)2Kb= 0.512◦C/m.1.99.744◦C2.101.394◦C3.100.930◦C4.100.256◦C5.100.000◦C6.99.070◦C00710.0 pointsWhat is the effective molality of a solutioncontaining 12.0 g of KI in 550 g water?As-sume 100 percent ionic dissociation.1.0.13 molal2.0.072 molal3.0.59 molal4.0.42 molal5.0.066 molal6.0.26 molal00810.0 pointsWhich of the following would likely dissolvein benzene?1.Ca(HCO3)22.Na2CO33.C6H12O64.Cl2CCCl25.NaCl00910.0 pointsCalculate the number of moles of oxygen thatwill dissolve in 45 L of water at 20◦C if the par-tial pressure of oxygen is 0.21 atm.Henry’sconstant for oxygen is 0.0013molL·atm.1.0.00027 mol2.0.0062 mol3.0.0013 mol4.0.012 mol5.0.28 mol01010.0 pointsThe osmotic pressure of 1.00 g of a polymerdissolved in benzene to give 200 mL of solu-tion is 1.50 kPa at 25◦C. Estimate the averagemolar mass of the polymer. The gas law con-stant is 0.0821 L·atm
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- Fall '08
- Solubility, Vapor pressure, Torr, Van 't Hoff factor