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What is the direct measure of work capacity or electrical energy available from a system?

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What is the direct measure of work capacity or electrical energy available from a system?

(a) Change in enthalpy

(b) Change in Gibbs free energy

(c) Reaction time

(d) Concentration of reactants

I got this question during an online exam.

My query is from Modern Theory Principles topic in portion Modern Theory Principles of Corrosion Engineering

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The correct choice is (b) Change in Gibbs free energy

Explanation: Change is Gibbs free energy is the difference of free energies of the reaction products and reactants. And it is a direct measure of the work capacity or maximum electrical energy available in from a system.

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