What is the thermodynamic quantity that provides the criterion for the spontaneity of a chemical reaction?

Question

Quizplus · Accepted Answer

ΔG (Gibbs free energy) provides the criterion for spontaneity of a chemical reaction. A negative ΔG indicates that the reaction is spontaneous, while a positive ΔG indicates that the reaction is non-spontaneous. ΔG is related to the other options, as ΔG = ΔH - TΔS = ΔU + PΔV - TΔS, but it is the most comprehensive measure of the system's ability to do work and the direction of the process under constant pressure and temperature conditions.

What Is the Thermodynamic Quantity That Provides the Criterion for the Spontaneity