Exam2A

# Exam2A - Name: _ Date: _ Version A Part 1.Calculation/Short...

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Name: __________________________ Date: _____________ Version A Part 1.Calculation/Short Answer problems (5 points each). Select the best answer from the given choices and MARK IT ON YOUR SCANTRON. 1. Given: SO 2 (g) b O 2 (g) + S(s) K c = 2.5 × 10 53 SO 3 (g) b 1/2O 2 (g) + SO 2 (g) K c = 4.0 × 10 13 Calculate K c for the reaction 2S(s) + 3O 2 (g) b 2SO 3 (g) A) 1.6 × 10 103 B) 1.6 × 10 80 C) 1.0 × 10 130 D) 1.6 × 10 40 E) 1.0 × 10 65 2. Which of the following equilibrium reactions is not affected by changes in pressure? A) 2BrCl(g) b Br 2 (g) + Cl 2 (g) B) H 2 (g) + Br 2 (l) b 2HBr(g) C) 2H 2 O 2 (l) b 2H 2 O(l) + O 2 (g) D) H 2 (g) + I 2 (s) b 2HI(g) E) 2CO 2 (g) b 2CO(g) + O 2 (g) 3. Write the equilibrium constant for 2NaBr(aq) + Pb(ClO 4 ) 2 (aq) b PbBr 2 (s) + 2NaClO 4 (aq). A) K = [Pb 2+ ][Br ] 2 B) K = 1/([Pb 2+ ][Br ] 2 ) CORRECT ANSWER C) K = [NaClO 4 ] 2 /([NaBr] 2 [Pb(ClO 4 ) 2 ] ACCEPTED ANSWER D) K = [PbBr 2 ]/([Pb 2+ ][Br ] 2 ) E) K = 1/([Pb(ClO 4 ) 2 ][NaBr] 2 ) 4. Calculate the vapor pressure at 25 ° C of a mixture of benzene and toluene in which the mole fraction of benzene is 0.650. The vapor pressure at 25 ° C of benzene is 94.6 Torr and that of toluene is 29.1 Torr. A) 84.4 Torr B) 124 Torr C) 51.3 Torr D) 71.7 Torr E) 61.5 Torr Page 1

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Version A Name_____________________________ Student ID_______________________________ 5. What is the molality of CrCl 3 in a solution prepared by dissolving 75.2 g chromium(III) chloride hexahydrate in 250.0 g of water.
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## This note was uploaded on 01/31/2010 for the course CHEM CHEM 6B taught by Professor Christinajohnson during the Spring '07 term at UCSD.

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Exam2A - Name: _ Date: _ Version A Part 1.Calculation/Short...

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