Electrochemistry

Electrochemistry

Question

The standard electrode potential (E°) for Daniell cell is +1·1 V. Calculate the   G° for the reaction

Zn(s) + Cu2+ (aq)  ----> Zn+ (aq) + Cu (s)

(1 F = 96500 C mol-1).

Answer

E° for Daniel cell = 1.1 V

Zn(s) + Cu2+ (aq)--->  Zn2+ (aq) + Cu(s)

1F = 96500 C mol-1

G° =?

n = 2 (no. of e-s exchanged)

Since,  G° = -nFE°

Therefore,  G° = -2 x 96500 x 1.1

G° = -212300 J mol-1

G° = -212.3 kJ mol-1

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