Molar Enthalpy of Formation of Various Substances
| Substance |
Formula |
M [kg/kmol] |
hfo [kJ/kmol] |
|---|---|---|---|
| Carbon |
C(s) |
12.001 |
0 |
| Hydrogen |
H 2 (g) |
2.016 |
0 |
| Nitrogen |
N 2 (g) |
28.012 |
0 |
| Oxygen |
O 2 (g) |
32 |
0 |
| Carbon monoxide |
CO(g) |
28.013 |
-110,530 |
| Carbon dioxide |
CO 2 (g) |
44.001 |
-393,520 |
| Water Vapor |
H 2 O(g) |
18.016 |
-241,820 |
| Water |
H 2 O(l) |
18.016 |
-285,820 |
| Hydrogen peroxide |
H 2 O 2 (g) |
34.016 |
-136,310 |
| Ammonia |
NH 3 (g) |
17.03 |
-46,190 |
| Methane |
CH 4 (g) |
16.043 |
-74,850 |
| Acetylene |
C 2 H 2 (g) |
26.038 |
226,730 |
| Ethylene |
C 2 H 4 (g) |
24.034 |
52,280 |
| Ethane |
C 2 H 6 (g) |
30.07 |
-84,680 |
| Propylene |
C 3 H 6 (g) |
42.051 |
20,410 |
| Propane |
C 3 H 8 (g) |
44.097 |
-103,850 |
| n-Butane |
C 4 H 10 (g) |
58.123 |
-126,150 |
| Benzene |
C 6 H 6 (g) |
78.114 |
82,930 |
| n-Octane |
C 8 H 18 (g) |
114.231 |
-208,450 |
| n-Octane |
C 8 H 18 (l) |
114.231 |
-249,950 |
| n-Dodecane |
C 12 H 26 (g) |
170.22 |
-291,010 |
| Methyl alcohol |
CH 3 OH(g) |
32.043 |
-200,670 |
| Methyl alcohol |
CH 3 OH(l) |
32.043 |
-238,660 |
| Ethyl alcohol |
C 2 H 5 OH(g) |
46.069 |
-235,310 |
| Ethyl alcohol |
C 2 H 5 OH(l) |
46.069 |
-277,690 |
| Oxygen |
O(g) |
16 |
249,190 |
| Hydrogen |
H(g) |
1.008 |
218,000 |
| Nitrogen |
N(g) |
14.006 |
472,650 |
| Hydroxyl |
OH(g) |
17.008 |
39,460 |
Adapted from
TEST
(
T
he
E
xpert
S
ystem
for
T
hermodynamics)
<
www.thermofluids.net
>
by S.Bhattacharjee, San Diego State University