At constant temperature and pressure, which is the correct relationship between ΔG and other thermodynamic quantities?
A) ΔG = ΔH - TΔS
B) ΔG = ΔH + TΔS
C) ΔG = ΔU - TΔS
D) ΔG = -TΔS
E) ΔG = q/T

Question

Quizplus · Accepted Answer

The correct relationship between ΔG and other thermodynamic quantities at constant temperature and pressure is ΔG = ΔH - TΔS, which is known as Gibbs-Helmholtz equation. Here, ΔH is the change in enthalpy, ΔS is the change in entropy, T is the absolute temperature, and ΔG is the change in Gibbs free energy. This equation shows that the change in Gibbs free energy is a function of both the change in enthalpy and the change in entropy.

At Constant Temperature and Pressure, Which Is the Correct Relationship