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Question

(D) In a galvanic cell,the electrical work done is given by $W_{elec} = nFE_{cell}$.For a spontaneous reaction,$\Delta G < 0$,which implies $E_{cell}

Vedclass · Accepted Answer

The magnitude of electrical work obtained from a galvanic cell always exceeds $|\Delta H|$ for the cell reaction.

Vedclass · Answer

(D) In a galvanic cell,the electrical work done is given by $W_{elec} = nFE_{cell}$.For a spontaneous reaction,$\Delta G  0$.At equilibrium,$\Delta G = 0$,which implies $E_{cell} = 0$.The electrical work obtained is related to the change in Gibbs free energy,$\Delta G = \Delta H - T\Delta S$.Since $\Delta G = -nFE_{cell}$,the maximum electrical work is $|\Delta G|$.According to the second law of thermodynamics,the electrical work obtained from a cell cannot exceed the total enthalpy change $|\Delta H|$ of the reaction,as some energy is always dissipated as heat $(T\Delta S)$.Therefore,the statement that electrical work always exceeds $|\Delta H|$ is incorrect.

Pick out the incorrect statement $:-$

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