For a cell reaction involving a two-electron change, the standard EMF of the cell is found to be...

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For a cell reaction involving a two-electron change, the standard EMF of the cell is found to be \( 0.295 \mathrm{~V} \) at \( 25^{\circ} \mathrm{C} \). The equilibrium constant of the reaction at \( 25^{\circ} \mathrm{C} \) will be
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