Chem_208_27_07_Web - Final Exam: Wednesday May 9, 7:00-9:30...

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1 Final Exam: Wednesday May 9, 7:00-9:30 PM Covers entire semester; slight emphasis on material since prelim 2. Last year’s Final posted online. Review 1: Sunday, May 6, 2:00-4:30 p.m., Baker 200 Review 2: Tuesday, May 8, 7:00-9:30 p.m., Baker 200 This Week: Finishing Ch 20, Starting 13.6 -13.8
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2 Combining Half Reactions: Use G o = -nFE o Given: Fe 3+ (aq) + e - Fe 2+ (aq) E o = 0.771 V Fe 2+ (aq) +2e - Fe(s) E o =-0.440 V Fe 3+ (aq) + 3e - Fe(s) →∆ G o = -1 x F x E o = -74.38kJ →∆ G o = -2 x F x E o = 84.91kJ V 0363 . 0 3(96,485C) - J 10.52x10 nF G E 3 o o = = = G o = -74.38kJ + 84.91 kJ = 10.52 kJ Nonspontaneous when connected to SHE A cell reduction potential E o is not a state function. For Hess’ Law Calculations, we always need to convert to a quantity that is a state function, in this case use G o = -nFE o. Add the G o values, then compute E o .
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3 Dry Cell Battery Oxidation: Zn(s) Zn 2+ + 2e - Reduction: 2MnO 2 (s) + H 2 O(l) +2e - Mn 2 O 3 (s) + 2OH - E cell = 1.55 V
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Chem_208_27_07_Web - Final Exam: Wednesday May 9, 7:00-9:30...

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