Recall of Thermodynamic principles Change in Gibbs free energy ΔG° = ΔH° - TΔS°

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