Exam 2 - Spring 2006

# Exam 2 - Spring 2006 - Name Signature Chem 0120 Golde...

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Name _____________________________ Signature ___________________________ Chem 0120 - Golde Exam II Spring Term 2006 Monday, March 27 INSTRUCTIONS DO NOT TEAR ANY PAGES OFF YOUR EXAM EXCEPT THE PERIODIC CHART. PRINT AND SIGN YOUR NAME AT THE TOP OF THIS PAGE. The exam contains 15 multiple-choice questions (5 2/3 points each) to be answered on the machine-scored sheet, using a soft pencil. Be sure to write and code in your name on this sheet. Do all your working on the exam sheets. Answer question 16 (7 points) on the exam sheet. The last 8 points will be given for your answers to questions marked *** in the exam. An answer key will be available in Room 101 after the exam (about 12 to 12:15pm). It will also be posted on our Blackboard Web site. USEFUL INFORMATION A periodic chart has been attached G = H - T ⋅∆ S R = 8.31 J/mol K G ° = -RT l nK F = 96,500 Coul/mol e - G ° = -nE ° F Charge = current x time G = G ° + RT l nQ 0 o C = 273 K At 298K, E = E o - 0.0257 n l n(Q) Avogadro’s # = 6.02 x 10 23 /mol ΔE = Δm.c 2 J = kg.m 2 /s 2 c = 3.00 x 10 8 m/s GOOD LUCK!!!

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1. Given the following information: 2 SO 2 (g) + O 2 (g) 2 SO 3 (g), ΔH o = -198 kJ S o , J/mol K 248.1 205.0 256.7 (i) Calculate ΔS o in J/K for this reaction. (ii) Calculate ΔG o in kJ for this reaction at a temperature of 455K. *** Show your work ΔS o , J/K ΔG o , kJ a) +17.2 +190 b) +17.2 -206 c) +17.2 -8.02 x 10 3 d) -187.8 -283 e) -187.8 +85.3 f) -187.8 -113 g) +196.4 -109 h) +196.4 -89.6 i) +196.4 -287 2. A certain reaction has a free energy change, ΔG o , equal to +23.7kJ at a temperature of 127 o C. Determine the equilibrium constant, K, of this reaction at this temperature. a) 195 b) 0.993 c) 14.0 d) 1.77 x 10 -10 e) 9.08 x 10 -6 f) 1.25 x 10 3 g) 0.00514 h) 2.86 x 10 22 i) 8.01 x 10 -4 j) 1.10 x 10 5
3. For which of the statements is the conclusion correct, i.e. is logically consistent with the given information? 1. A certain reaction is exothermic. We conclude that ΔH

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Exam 2 - Spring 2006 - Name Signature Chem 0120 Golde...

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