quiz_answers_Quiz_03_key_152A

quiz_answers_Quiz_03_key_152A - ∆ G and K with the...

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Q u i z # 3 N a m e _ _ Answer Key _____ CHEM 152 Quiz Section______ Problem 1 (1a-1pt 1b-1pt 1c-2pt) Fill in the Blanks a) Current always flows from the ___ Anode _________ to the ____ Cathode ________. b) Galvanic cells require ____ E o cell > 0 ________. c) The standard hydrogen electrode is described by this reaction: 2H + +2e - H 2 with E ° =0.00V __. Problem 2 (2a-2pt 2c-2pt 2c-2pt) Given: Au +3 (aq) + 3e - Æ Au (s) E° = 1.50 V Tl + (aq) + e - Æ Tl (s) E° = -0.34V a) Write the overall reaction and determine E° cell + + + + ) ( ) ( ) ( 3 ) ( 3 3 aq s s aq Tl Au Tl Au V V V E o cell 84 . 1 34
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Unformatted text preview: ∆ G and K with the values (but do not solve these equations) o cell o nFE G − = ∆ 0591 . log o nE K = ( ) ( )( ) V mol V J mol G o 84 . 1 96485 3 1 1 − − ⋅ − = ∆ ( )( ) 0591 . 84 . 1 3 0591 . 10 10 = = o nE K c) Write the formula for E cell when [Au +3 ]=5 X 10-2 M and [Tl + ]=2.0 X 10-4 Q n E E o log 0591 . − = [ ] [ ] + + = 3 3 Au Ti Q [ ] [ ] ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − = − − 2 3 4 10 5 10 . 2 log 3 0591 . 84 . 1 x x V E...
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This note was uploaded on 04/12/2008 for the course CHEM 152 taught by Professor Chiu during the Winter '08 term at University of Washington.

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