Electrochemistry

  • Question
    CBSEENCH12010305

    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).

    Solution

    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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