ΔH | ΔS | ΔG | Nature of reactions |
---|---|---|---|
-ve | +ve | always -ve | Spontaneous at all temperatures |
+ve | -ve | always +ve | Non spontaneous at all temperatures |
-ve | -ve | may be +ve or -ve | Spontaneous if T < (ΔH/ΔS) Non spontaneous if T > (ΔH/ΔS) |
+ve | +ve | may be +ve or -ve | Spontaneous if T > (ΔH/ΔS) Non spontaneous if T < (ΔH/ΔS) |
Where ΔH = Change in enthalpy, ΔS = Change in entropy, ΔG = Change in Gibbs free energy |