All the energy released from the reaction
$$X \to Y, \Delta _tG^o $$ = -193 kJ mol^-1 is used for oxidizing M⁺ as M⁺ $$\to$$ M³⁺ + 2e^-, E^o = -0.25 V
Under standard conditions, the number of moles of M⁺ oxidized when one mole of X is converted to Y is [F = 96500 C mol^–1]