Environmental Engineering Reference
In-Depth Information
Appendix2
Standard Free Energy,
Enthalpy, and Entropy of
Formation for
Compounds of
Environmental
Significance
G f
H f
S f
Compound (kJ/mol)
Δ
(kJ/mol)
Δ
(J/K/mol)
H + (aq)
0
0
0
H 2 O(l)
237.2
285.8
69.9
H 2 O(g)
228.6
241.8
188.7
OH (aq)
157.5
230.3
10.7
CO 2
3
(aq)
527.9
677.1
56.9
HCO 3 (aq)
586.8
692.0
91.2
H 2 CO 3 (aq)
623.2
699.7
187.0
CO 2 (g)
394.4
393.5
213.6
HOCl(aq)
80.0
121.1
142.5
H 2 S(g)
33.6
20.6
205.7
H 2 S(aq)
27.9
39.8
121.3
HS (aq)
12.0
17.6
62.8
S 2 (aq)
85.8
33.0
14.6
SO 2
4
744.6
909.2
(aq)
20.1
Cl (aq)
131.6
167.2
56.5
Cl 2 (aq)
6.9
23.4
121.0
Ca 2 + (aq)
553.5
542.8
53.0
CaCO 3 (s)
1127.8
1207.4
88.0
continued
431
 
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