Question

What temperature standard free energy change is zero?

Answer 1

At room temperature, the Gibbs free energy already is at its minimum under equilibrium condition.

But to make it zero, you need to minimize it further by extracting continuous work, which can only be done by operating near absolutely zero temperature.

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Answer 2

Thus ΔG = 0, and the liquid and vapor are in equilibrium, as is true of any liquid at its boiling point under standard conditions. At 110°C, ΔG<0, and vaporization is predicted to occur spontaneously and irreversibly. At 90°C, ΔG > 0, and water does not spontaneously convert to water vapor.