Question

How does Gibbs energy of a reaction relate to entropy and enthalpy?

Answer 1

Gibbs free energy combines enthalpy and entropy into a single value.

Gibbs free energy is the energy associated with a chemical reaction that can do useful work. It equals the enthalpy minus the product of the temperature and entropy of the system.

G = H – TS

At constant temperature

ΔG = ΔH – TΔS

ΔG predicts the direction of a chemical reaction. If ΔG is negative, then the reaction is spontaneous. If ΔG is positive, then the reaction is non-spontaneous.

Answer 2

Gibbs free energy combines enthalpy and entropy into a single value. Gibbs free energy is the energy associated with a chemical reaction that can do useful work. It equals the enthalpy minus the product of the temperature and entropy of the system. ... If ΔG is negative, then the reaction is spontaneous.