Discuss the effect of temperature change on the spontaneity of the following reactions at 1 atm. 

(a) Al2O3(s) + 2Fe(s) —> 2Al(s) + Fe2O3(s)  [ΔH° = +851.5 kJ; ΔS° = +38.5 J/K]

(b) N2H4(l) —> N2(g) + 2H2(g)  [ΔH° = -50.6 kJ; ΔS° = 0.3315 kJ/K] 

(c) SO3(g) —> SO2(g) + 1/2O2(g)  [ΔH° = 98.9 kJ; ΔS° = +0.0939 kJ/K