Which equation is a correctly written thermochemical equation?

C3H8 (g) + 5O2 (g)→3CO2 (g) + 4H2O (l) , ΔH= −2,220 kJ/mol

Fe (s) + O2 (g)→Fe2O3 (s) , ΔH= −3,926 kJ

NH4Cl→NH4 + + Cl−

2C8H18 + 25O2→16CO2 + 18H2O , ΔH= −5,471 kJ/mol