Determine the G for a voltaic cell made of a Zn strip and a

Determine the G° for a voltaic cell made of a Zn strip and a Pb strip immersed in 1.0 M aqueous Zn(NO3)2 and Pb(NO3)2 solutions, respectively, with all other cell components in place.

Solution

Reduction potential of Zn/Zn+2 = - 0.76 V

Reduction potential of Pb/Pb+2 = - 0.13 V

Oxidation : Zn (s)   ---------------> Zn+2 +   2e-

Reduction : Pb+2 +   2e-    -------------> Pb (s)

Eocell = Eored - Eooxi

          = - 0.13 - (- 0.76)

Eocell = 0.63 V

G° = - n F Eocell

        = - 2 x 96485 x 0.63 x 10^-3

G° = - 121.6 kJ/mol