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`Delta_(r) G^(@)= - RT " In K. For the same reaction at the same temperature using " K_(p) and K_(p) " the values "Delta _(r)G^(@) " ` are found to be different . Why ?

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The numerical value of equilibrium constant depends upon the standard state chosen for expressing concentrations or pressures. In case of pressures, the standard state chosen is 1 bar wheras in case of concentrations, standard state chosen is `1" mol "L^(-1). " Hence " , Delta_(r) G^(@)` values are different.

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