Question

Does ΔG = 0 at equilibrium?

Answer 1

If a system is at equilibrium, ΔG = 0. ... If the process is not spontaneous as written but is spontaneous in the reverse direction, ΔG > 0. At constant temperature and pressure, ΔG is equal to the maximum amount of work a system can perform on its surroundings while undergoing a spontaneous change

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Answer 2

Thus some amount of reaction will occur even if ΔG° for the process is positive. ... In contrast to ΔG° which is a constant for a given reaction, ΔG varies continuously as the composition changes, finally reaching zero at equilibrium. ΔG is the “distance” (in free energy) from the equilibrium state of a given reaction.