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Question

What is the free energy change for (a) galvanic cell (b) electrolytic cell?

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Solution

Dear Student, Gibbs free energy is a measure of spontaneity in a reaction. (a) In a galvanic cell that is spontaneous, Gibbs free energy decreases as the cell moves towards a more stable equilibrium. It is the useful work done by the cell. It is with negative sign. b) In an electrolytic cell, energy is added to the reaction (like charging a battery.) In this case there is increase in the Gibbs energy. It is the useful work done on the cell by external power. It is with positive sign. Regards

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