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Exam 2 - Spring 2007

Exam 2 - Spring 2007 - Name Signature Chem 0120 Golde...

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Name _____________________________ Signature ___________________________ Chem 0120 - Golde Exam II Spring Term 2007 Wednesday, March 28 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 16 multiple-choice questions (5.5 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 17 (6 points) on the exam sheet. The last 6 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. If one is given the ΔH o f and ΔG o f values at 25 o C for each of the reagents and products in a chemical reaction, one can determine a lot about the reaction. Which one of the following items (a) through (d) can not be determined? If all can be determined, select response (e). Note that ΔH o f is the standard molar enthalpy of formation; also we can assume that ΔH o and ΔS o of a reaction are independent of temperature. a) ΔG o of the reaction at 25 o C. b) ΔS o of the reaction at 25 o C c) ΔG o of the reaction at 50 o C d) ΔG of the reaction for specified non-standard concentrations of the reagents and products at 25 o C e) All of (a) – (d) can be determined 2. For the gas phase reaction: 2 IBr(g) I 2 (g) + Br 2 (g), K p = 288 at a temperature of 450 o C. Determine ΔG o in kJ for this reaction at 450 o C.
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