Free Energy Change
What is Free Energy Change?
Free energy change (ΔG) is the thermodynamic quantity that predicts the spontaneity of a process at constant temperature and pressure. It is defined by the Gibbs equation: ΔG = ΔH − TΔS, where ΔH is enthalpy change, T is absolute temperature, and ΔS is entropy change. A negative ΔG indicates a spontaneous process, a positive ΔG indicates a non-spontaneous process, and ΔG = 0 indicates the system is at equilibrium.
Key Facts
Frequently Asked Questions
Free energy change (ΔG) is the thermodynamic quantity that predicts the spontaneity of a process at constant temperature and pressure. It is defined by the Gibbs equation: ΔG = ΔH − TΔS, where ΔH is enthalpy change, T is absolute temperature, and ΔS is entropy change. A negative ΔG indicates a spontaneous process, a positive ΔG indicates a non-spontaneous process, and ΔG = 0 indicates the system is at equilibrium.