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16 July, 18:35

The equilibrium constant for the reaction sr (s) + mg2 + (aq) ⇌ sr2 + (aq) + mg (s) is 3.69 * 1017 at 25°c. calculate e o for a cell made up of sr / sr2 + and mg / mg2 + half-cells.

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  1. 16 July, 19:36
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    We are going to use this formula:

    E° = 0.0592 / n * ㏒K

    when E° is the standard state cell potential

    and n is number of moles of electrons transferred in the balanced equation

    for the reaction of the cell.

    Sr (s) + Mg2 + (aq) ↔ Sr2 + (aq) + Mg (s)

    we can get it by using the given balanced equation, we here have 2 electrons

    transferred so, n = 2

    and K the equilibrium constant = 3.69 x 10^17

    so, by substitution:

    ∴ E° = 0.0592 / 2 * ㏒ (3.69 x 10^17)

    = 0.52 V
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