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5 May, 14:38

Calculate the standard potential, e∘, for this reaction from its equilibrium constant at 298 k. x (s) + y4 + (aq) ↽--⇀x4 + (aq) + y (s) k=4.98*10-5

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  1. 5 May, 16:45
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    First, we need to get the number of moles:

    from the reaction equation when Y4 + takes 4 electrons and became Y, X loses 4 electrons and became X4+

    ∴ the number of moles n = 4

    we are going to use this formula:

    ㏑K = n * F * E/RT

    when K is the equilibrium constant = 4.98 x 10^-5

    and F is Faraday's constant = 96500

    and the constant R = 8.314

    and T is the temperature in Kelvin = 298 K

    and n is number of moles of electrons = 4

    so, by substitution:

    ㏑4.98 x 10^-5 = 4*96500*E / 8.314*298

    ∴E = - 0.064 V
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