Question

Calculate delta G at 25 C for: Assume smallest whole-number coefficients. a. MnO2 (s) + 4H...

Calculate delta G at 25 C for: Assume smallest whole-number coefficients.

a. MnO2 (s) + 4H + (aq) + 2I- (aq)----------------Mn 2+ (aq) + 2H20 + I2 (s)

b. H2 (g) + 2OH- (aq) + S(s) ---------------2H2O + S2- (aq)

c. an Ag-Ag+ half-cell and an Au-AuCl4- half cell

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Homework Answers

Answer #1

a. Eo = Ecathode - Eanode

         = 1.23 - 0.535

         = 0.695 V

dG = -nFEo

      = -2 x 96485 x 0.695

      = -134.11 kJ/mol

b. Eo = Ecathode - Eanode

         = -0.48 - (-0.8277)

         = 0.3477 V

dG = -nFEo

      = -2 x 96485 x 0.3477

      = -67.10 kJ/mol

c. Eo = Ecathode - Eanode

         = 1.0 - 0.8

         = 0.2 V

dG = -nFEo

      = -3 x 96485 x 0.2

      = -57.89 kJ/mol

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