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Exam 2 - Spring 2008

Exam 2 - Spring 2008 - Multiple Choice(out of 85 Score(out...

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Multiple Choice *** Score Total (out of 85) (out of 15) (out of 100) Name _____________________________ Signature ___________________________ Chem 0120 - Golde Exam II Spring Term 2008 Friday, March 28 INSTRUCTIONS DO NOT TEAR ANY PAGES OFF YOUR EXAM. 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 (last name, space, first name). 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 is on the reverse of this sheet – PLEASE DO NOT DETACH 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 1g = 6.02 x 10 23 amu c = 3.00 x 10 8 m/s GOOD LUCK!!!
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1. A certain reaction has an equilibrium constant, K, of 2.91 x 10 -13 at a temperature of 575K. Determine the free energy change, ΔG o , in kJ for this reaction at 575K. a) -29.3kJ b) -59.9kJ c) +0.0185kJ d) +2.93 x 10 4 kJ e) -5.36kJ f) +4.78kJ g) +5.99 x 10 4 kJ h) +138kJ i) +67.4kJ j) -1.39 x 10 -9 kJ 2. We have seen symbols such as ΔG and ΔG o . Which one of the following statements is NOT correct? a) The superscript o denotes “standard” conditions. b) In thermodynamics, standard conditions mean that each solution has a 1M concentration, that each gas has a partial pressure of 1atm and that the temperature is specified. c) Under standard conditions, the reaction quotient, Q, has the value 1 (one). d) Both the equations ΔG o = ΔH o –T.ΔS o and ΔG = ΔH –T.ΔS are valid. e) Both the equations: ΔG o = -RT ln(K) and ΔG = -RT ln(K) are valid.
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