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Unformatted text preview: kamalska (mk23835) – HW02 – Quigley – (104001) 1 This printout should have 30 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 10.0 points What is the maximum possible value of the van’t Hoff factor for a solution of the strong electrolyte FeCl 3 that is so dilute that no ion association occur? 1. i = 2 2. i must be an odd number. 3. i = 0 4. i = 6 5. i = 4 002 (part 1 of 3) 10.0 points For the next three questions, consider the following pressure diagram for a binary liquid containing A and B. 1 x A 90 torr 60 torr If 1760 g of A (110 g / mol) and 1995 g of B (105 g / mol) are mixed, what is the vapor pressure of B? 1. 27 torr 2. 48 torr 3. 76 torr 4. 90 torr 5. 60 torr 003 (part 2 of 3) 10.0 points What is the corresponding vapor pressure of A? 1. 90 torr 2. 27 torr 3. 60 torr 4. 48 torr 5. 76 torr 004 (part 3 of 3) 10.0 points What is the corresponding total vapor pres sure? 1. 90 torr 2. 60 torr 3. 48 torr 4. 76 torr 5. 27 torr 005 10.0 points Chemical processes, like dissolving solids, are favored by (decreased, increased) potential energy and (decreased, increased, unchanged) disorder. 1. increased; increased 2. decreased; decreased 3. increased; decreased 4. decreased; increased 5. increased; unchanged 006 10.0 points A wellbehaved (nonvolatile, nonionic) so lute is dissolved in water to yield a solution that freezes at . 930 ◦ C. At what temper ature would this solution boil under 1.0000 atm pressure? Note that K f = 1 . 86 ◦ C/ m , kamalska (mk23835) – HW02 – Quigley – (104001) 2 K b = 0 . 512 ◦ C /m . 1. 99.744 ◦ C 2. 101.394 ◦ C 3. 100.930 ◦ C 4. 100.256 ◦ C 5. 100.000 ◦ C 6. 99.070 ◦ C 007 10.0 points What is the effective molality of a solution containing 12.0 g of KI in 550 g water? As sume 100 percent ionic dissociation. 1. 0.13 molal 2. 0.072 molal 3. 0.59 molal 4. 0.42 molal 5. 0.066 molal 6. 0.26 molal 008 10.0 points Which of the following would likely dissolve in benzene? 1. Ca(HCO 3 ) 2 2. Na 2 CO 3 3. C 6 H 12 O 6 4. Cl 2 CCCl 2 5. NaCl 009 10.0 points Calculate the number of moles of oxygen that will dissolve in 45 L of water at 20 ◦ C if the par tial pressure of oxygen is 0.21 atm. Henry’s constant for oxygen is 0.0013 mol L · atm ....
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 Spring '08
 QUIGLEY
 Solubility, Vapor pressure, Torr, Van 't Hoff factor

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