MakeUpExam1 - Version 025 Make up Exam 1 laude(51155 This print-out should have 30 questions Multiple-choice questions may continue on the next column

# MakeUpExam1 - Version 025 Make up Exam 1 laude(51155 This...

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Version 025 – Make up Exam 1 – laude – (51155) 1Thisprint-outshouldhave30questions.Multiple-choice questions may continue onthe next column or page – find all choicesbefore answering.0016.0pointsRank the following salts from greatest to leastmolar solubility:A container holds a mixture of acetone andwater at 40C. Ifχacet, the mole fractionof acetone, is 0.1, what is the total vaporpressure?(The equilibrium vapor pressuresfor pure acetone and pure water at 40C areroughly 400 torr and 50 torr respectively.) A) AgI K sp = 8 . 52 × 10 17 B) ZnF K sp = 0 . 0304 C) PbSO 4 K sp = 2 . 53 × 10 8 D) CsClO 4 K sp = 0 . 00395 1. B > D > A > C 2. B > D > C > A correct 3. D > C > B > A 4. D > B > C > A Explanation: All of the salts are composed of a single cation and anion, so the solubility of each is the square root of its K sp . 002 6.0points Consider the reaction, A( aq ) + B( aq ) ←→ C( aq ) The equilibrium constant, K , is 10. If you dissolved 0.2 moles of A, 1.0 moles of B and 1.6 moles of C in 2 liters of water, which of the following would occur. 1. the reaction would move right 2. the reaction would move left correct 3. nothing would occur 4. not enough information 003 6.0points 1. 50 torr 2. 40 torr 3. 365 torr 4. 85 torr correct 5. 400 torr Explanation: P = P H 2 O + P acet = χ H 2 O P H 2 O + χ acet P acet = (1 - χ acet ) P H 2 O + χ acet P acet = (0 . 9)(50) + (0 . 1)(400) = 85 004 6.0points Rank the following liquids by their misci- bility in heptane (C 7 H 16 ), from most miscible to least: NH 3 , CH 3 OH, CH 3 CH 2 F, CCl 4 . 1. CCl 4 > CH 3 CH 2 F > NH 3 > CH 3 OH 2. CH 3 CH 2 F > CCl 4 > CH 3 OH > NH 3 3. CCl 4 > CH 3 CH 2 F > CH 3 OH > NH 3 correct 4. NH 3 > CH 3 OH > CH 3 CH 2 F > CCl 4 5. CH 3 CH 2 F > CH 3 OH > CCl 4 > NH 3 Version 025 – Make up Exam 1 – laude – (51155) 2and very polar (exhibiting hydrogen bond-ing), and ammonia is the most polar of theliquids, and thus least soluble.0056.0pointsIf 100 mL of 0.2 M CHOOH and 400 mLof 0.5 M NaCHOO are mixed, what is the pHof the resulting solution? Assume the pKaofformic acid is 3.7.  • • • 