Standard Free Energy, Enthalpy, and Entropy of Formation for Compounds of Environmental Significance - Elements of Environmental Engineering: Thermodynamics and Kinetics - page 432

G f H f S f

Compound (kJ/mol) Δ (kJ/mol) Δ (J/K/mol)

Fe(metal) 0 0 27.3

Fe 2 + (aq) − 78.8 − 89.1 − 138.0

FeS(s) − 100.6 − 100.1 60.4

FeS 2 (s) − 167.2 − 178.5 53.0

Fe(OH) 3 (s) − 697.6 − 824.2 106.8

Na + (aq)

− 262.2 − 240.5 59.1

NH 3 (g) − 16.5 − 46.1 192.0

NH 3 (aq) − 26.6 − 80.3 111.0

NH 4 (aq) − 79.4 − 132.5 113.4

CH 4 (g) − 50.8 − 74.8 186.0

Note: All values are at 298 K.
Source: Obtained fromWagman, D.D. et al. SelectedValuesofChemical
ThermodynamicsProperties . US National Bureau of Standards,
Technical Notes, pp. 270-273 (1968), pp. 270-274 (1969),
pp. 270-275 (1971).