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18 September, 04:06

Calculate δg o for the reaction between al (s) and cd2 + (aq). enter your answer in scientific notation.

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  1. 18 September, 04:34
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    The reaction between Al (s) and Cd²⁺ (aq) is:

    Al (s) + Cd²⁺ (aq) → Al³⁺ (aq) + Cd (s)

    The half reactions are:

    Al³⁺ (aq) + 3 e⁻ → Al (s) E⁰ = - 1.66 V

    Cd²⁺ (aq) + 2 e⁻ → Cd (s) E⁰ = - 0.40 V

    Reverse the first equation and add to the second one

    2 Al (s) + 3 Cd²⁺ (aq) → 2 Al³⁺ (aq) + 3 Cd (s)

    So, the overall cell potential is:

    E⁰cell = 1.66 - 0.40 = 1.26 V

    Free energy of the reaction is:

    ΔG⁰ = - n F E⁰cell

    = - 6 mol e⁻ * (96485 C / mol e⁻) * (1.26 V)

    = - 7.29 x 10⁵ J
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