S10E2A-AK - Multiple Choice (out of 85) #16 & * (out of 15)...

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Multiple Choice #16 & *** Total (out of 85) (out of 15) (out of 100) Name _____________________________ Signature ___________________________ Chem 0120 - Golde EXAM II Spring Term 2010 Friday, April 2 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 (last name, space, first name). Do all your working on the exam sheets. Answer question 16 (6 points) on the exam sheet. The last 9 points will be given for your answers to questions marked *** in the exam. The answer key will 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 > means greater than; < means less than GOOD LUCK!!!
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1. In Appendix C of Ebbing, in the column headed S o (J/mol K), the entry for Pb(s) is 64.78. Which one statement is completely correct? All the statements refer to 25 o C. A) Pb(s) has an absolute entropy change, ΔS o , of 64.78. B) The standard enthalpy of formation of Pb(s) is 64.78 kJ/mol K. C) The entropy of formation of Pb(s) is 64.78 J/mol K. D) The standard absolute entropy of Pb(s) is 64.78 J/mol K. E) The value is a misprint: all elements in their standard states have an S o value of zero. 2. HF is a weak acid. For the process: HF(aq) + H 2 O H 3 O + (aq) + F - (aq), ΔH o = -12.5kJ and ΔS o = -103 J/mol K. Calculate ΔG o in kJ for this process at 25 o C. *** Is the magnitude and/or the sign of your answer as expected? Give your reasoning.
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This note was uploaded on 02/20/2011 for the course CHEM 110 taught by Professor Dr.huston during the Spring '06 term at Pittsburgh.

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S10E2A-AK - Multiple Choice (out of 85) #16 & * (out of 15)...

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