| May 6, 2022, 5:41 p.m.
Table below will provide approximate values of molar mass, enthalpy of formation, gibbs function of formation, higher and lower heating value and absolute entropy for some commonly used substances.
Please note that all the values shown below are at 298K temperature and 1 atm pressure.
|
Substance |
Molar mass(g/mol) |
Enthalpy of formation(kJ/mol) |
Absolute entropy (kJ/molK) |
Gibbs function of formation (kJ/mol) |
Lower heating value (MJ/kg) |
Higher heating value (MJ/kg) |
|
Carbon(s) |
12 |
0 |
0.006 |
0 |
33 |
33 |
|
Oxygen(g) |
32 |
0 |
0.20 |
0 |
- |
- |
|
Carbon monoxide(g) |
28 |
-110.5 |
0.198 |
-137.2 |
- |
- |
|
Carbon dioxide(g) |
44 |
-393.5 |
0.214 |
-394.4 |
- |
- |
|
Hydrogen(g) |
2 |
0 |
0.13 |
0 |
120 |
142 |
|
Nitrogen(g) |
28 |
0 |
0.192 |
0 |
- |
- |
|
Water(g) |
18 |
-241.8 |
0.189 |
-228.6 |
- |
- |
|
Water(l) |
18 |
-285.8 |
0.07 |
-237.1 |
- |
- |
|
Ammonia(g) |
17 |
-46.2 |
0.192 |
-16.5 |
- |
- |
|
Hydrogen peroxide(g) |
34 |
-136.3 |
0.233 |
-105.7 |
- |
- |
|
Benzene(g) |
78 |
82.9 |
0.269 |
129.7 |
40.5 |
42.2 |
|
Methyl alcohol(g) |
32 |
-200.9 |
0.239 |
-162.1 |
21.2 |
23.9 |
|
Methyl alcohol(l) |
32 |
-238.8 |
0.129 |
-166.2 |
20 |
22.8 |
|
Ethyl alcohol(g) |
46 |
-235.3 |
0.282 |
-168.5 |
27.8 |
30.6 |
|
Ethyl alcohol(l) |
46 |
-277.7 |
0.160 |
-174.9 |
26.7 |
29.7 |
|
Propylene(g) |
42 |
20.4 |
0.267 |
62.7 |
45.8 |
49 |
|
Propane(g) |
44 |
-103.8 |
0.269 |
-23.5 |
46.5 |
50.3 |
|
Butane(g) |
58 |
-126.1 |
0.310 |
-15.7 |
46 |
49.8 |
|
Pentane(g) |
72 |
-146.4 |
0.348 |
-8.2 |
45.4 |
49 |
|
Octane(g) |
114 |
-208.5 |
0.464 |
17.3 |
44.8 |
48.4 |
|
Octane(l) |
114 |
-250 |
0.360 |
6.6 |
44.4 |
48 |
|
Ethylene(g) |
28 |
52.3 |
0.220 |
68.1 |
47.2 |
50.4 |
|
Ethane(g) |
30 |
84.7 |
0.230 |
-32.9 |
47.3 |
51.6 |
|
Methane(g) |
16 |
-75 |
0.186 |
-50.8 |
50 |
55 |
|
Acetylene(g) |
26 |
226.7 |
0.201 |
209.2 |
48.2 |
50 |
|
Hydroxyl(g) |
17 |
39.5 |
0.184 |
34.3 |
- |
- |