4.1 Ideal-Gas Reaction Free Energy Changes, ∆G 0 j (T ; P 0 ) Ideal-gas reaction free energy values ∆G 0 j (T, P ) in Eq. ( ) were obtained at T = 283. Eq. (20). We then expressed the temperature dependence of the amine deprotonation and carbamate reversion ideal-gas reaction free energies in the form