Solutions-Electrochemistry Practice Problems

Solutions-Electrochemistry Practice Problems -...

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1 Electrochemistry Practice Problems F = 96,500 coulombs • mole –1 R = 8.314 joules • mole –1 • K –1 1. Calculate E° and K for the following reactions: A) Mg (s) + Cl 2 (g) Mg 2+ + 2 Cl Mg(s) Mg 2+ + 2e - +2.360 volts Cl 2 (g) + 2e - 2Cl - +1.360 volts Mg (s) + Cl 2 (g) Mg 2+ + 2 Cl - +3.720 volts 126 ) 298 )( 314 . 8 )( 3 . 2 ( ) 72 . 3 )( 500 , 96 )( 2 ( 10 10 = = K B) 5 MnO 2 (s) + 4 H + 3 Mn 2+ + 2 MnO 4 + 2H 2 O 5 MnO 2 (s) + 10 H 2 O 5 MnO 4 + 20 H + + 15e - -1.692 volts 3 MnO 4 + 24 H + + 15e - 3 Mn 2+ + 12H 2 O +1.507 volts 5 MnO 2 (s) + 4 H + 3 Mn 2+ + 2 MnO 4 + 2H 2 O -0.185 volts 47 ) 298 )( 314 . 8 )( 3 . 2 ( ) 185 . 0 )( 500 , 96 )( 15 ( 10 10 = = K K RT nFE G ln 0 = = = RT nFE K 3 . 2 0 10 = = reactants products log n 0.059 E reactants products ln nF RT E E 10 0 0 cell
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2 C) I 2 (s) + 5Br 2 (aq) + 6H 2 O 2IO 3 + 10 Br + 12H + 5Br 2 (aq) + 10e - 10 Br +1.098 volts I 2 (s) + 6H 2 O 2IO 3 + 12H + + 10e - -1.210 volts
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Solutions-Electrochemistry Practice Problems -...

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