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Unformatted text preview: Chemistry 102 04/24/08 1. The standard cell potential, E (cell), for the reaction of silver ions with copper metal is + .46 V at 25 C. Calculate G for this reaction. Cu^2+(aq) + 2e- Cu(s) E = +.34 Anode (-) (Oxidation) Ag^+(aq) + e- Ag(s) E = .80 Cathode (+) (Reduction) Ox: Cu(s) Cu^2+(aq) + 2e- Red: Ag^+(aq) + e- Ag(s) x2 Cu(s) + 2Ag(aq) Cu^2+(aq) + 2Ag(s) Cu: Anode oxidized Ag: Cathode reduced E (cell) = E (cathode) - E (anode) = .80V (.34V) = .46 G = -nFT ; F= 96500 C/mol e- n=2 because there are 2e- transferred G = -(2 mol e-) (96,500 C/mol e-) (+.46V)-89,200 C*V = -89.2 KJ Spontaneous 2. Which of the following metals will react with H+(aq) to produce H2 in a product-favored reaction: Cu,Al,Ag,Fe,Zn? Cu^2+ + 2e- Cu(s) E = .34V Al^3+ + 3e- Al(s) E = -1.66 V Ag+(aq) + e- Ag(s) E = .80V Fe^2+(aq) + 2e- Fe(s) E = -.44 V Zn^2+ + 2e- Zn(s) E = -.76V 3. A voltaic cell is set up at 253....
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- Spring '08