Example 2.16: Estimate the Gibbs energy of formation of water at 350 °K given the following data: ΔH^o_f298 = -57798 cal/mol, ΔG^o_f298 = -54635 cal/mol.

Solution

$ Entropy of formation ΔS^o_f (Equation 2.48)

$ Energy of formation, ΔG (Equation 2.48, T = 350 °K)

$ Heat of formation, ΔH_f350 (without C_p data) = ΔH₂₉₈ = -57798 cal/mol

$ Entropy of formation, ΔS_f350 (without C_p data) = ΔS₂₉₈ = -10.609 cal/(mol·°K)

$ Energy of formation, ΔG_f350 (Equation 2.48)