Which of the reactions below will be spontaneous only at low temperatures?
a) 2 CO(g) O2(g) ⟶ 2 CO2(g) ΔHrxn = −566.0 kJ/mol
b) 2 NO2(g) ⟶ 2 NO(g) O2(g) ΔHrxn = 1131.1 kJ/mol
c) NH4CO2NH2(s) ⟶ 2 NH3(g) CO2(g) ΔHrxn = 159.2 kJ/mol
d) PCl3(g) Cl2(g) ⟶ PCl5(g) ΔHrxn = −87.9 kJ/mol
e) NO(g) 1 2 Cl2(g) ⟶ NOCl(g) ΔHrxn = −38.54 kJ/mol