版权所有：华东理工大学物理化学教研室 6 2) Exergonic and endergonic reactions 9.1 The Gibbs energy minimum The spontaneity of a reaction at constant temperature and pressure is expressed by the reaction Gibbs energy: If ΔrG <0, the forward reaction is spontaneous; it is called exergonic (work-producing) If ΔrG >0, the reverse reaction is spontaneous; it is called endergonic (work-consuming) If ΔrG = 0, the reaction is at equilibrium; it is spontaneous in neither direction, and neither exergonic nor endergonic版权所有：华东理工大学物理化学教研室 6 2) Exergonic and endergonic reactions 9.1 The Gibbs energy minimum The spontaneity of a reaction at constant temperature and pressure is expressed by the reaction Gibbs energy: If ΔrG <0, the forward reaction is spontaneous; it is called exergonic (work-producing) If ΔrG >0, the reverse reaction is spontaneous; it is called endergonic (work-consuming) If ΔrG = 0, the reaction is at equilibrium; it is spontaneous in neither direction, and neither exergonic nor endergonic