Electrochemistry

  • Question
    CBSEENCH12010460

    (a) Calculate increment subscript straight r straight G for the reaction
    Mg (s) + Cu2+ (aq) → Mg2+ (aq) + Cu (s)
    Given : E°cell = + 2.71 V, 1 F = 96500 C mol−1
    (b) Name the type of cell which was used in Apollo space programme for providing electrical power.

    Solution

    (a) For the cell reaction,

    Mg (s) + Cu2+ (aq) → Mg2+ (aq) + Cu (s) E°cell = + 2·71 V

    The change in the standard Gibbs free energy is given as:

    increment subscript straight r straight G= −nFE°cel. = −2 x 96500 x 2.71 = -523030 Jmol−1

    b) The fuel cell which uses the reaction of hydrogen with oxygen to form water was used in Apollo space programme for providing electrical power.

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