Related Resources: thermodynamics
Molar Mass Gas Constant
Thermodynamics Related Resources
Molar mass, gas constant, and critical-point properties of various gasses
Substance
|
Formula
|
Molar mass,
M kg/kmol |
Gas constant,
R kJ/kg · K* |
Critical-point properties
|
||
Temperature,
K |
Pressure,
MPa |
Volume,
m3/kmol |
||||
Air
|
—
|
28.97
|
0.2870
|
132.5
|
3.77
|
0.0883
|
Ammonia
|
NH3
|
17.03
|
0.4882
|
405.5
|
11.28
|
0.0724
|
Argon
|
Ar
|
39.948
|
0.2081
|
151
|
4.86
|
0.0749
|
Benzene
|
C6H6
|
78.115
|
0.1064
|
562
|
4.92
|
0.2603
|
Bromine
|
Br2
|
159.808
|
0.0520
|
584
|
10.34
|
0.1355
|
n-Butane
|
C4H10
|
58.124
|
0.1430
|
425.2
|
3.80
|
0.2547
|
Carbon dioxide
|
CO2
|
44.01
|
0.1889
|
304.2
|
7.39
|
0.0943
|
Carbon monoxide
|
CO
|
28.011
|
0.2968
|
133
|
3.50
|
0.0930
|
Carbon tetrachloride
|
CCl4
|
153.82
|
0.05405
|
556.4
|
4.56
|
0.2759
|
Chlorine
|
Cl2
|
70.906
|
0.1173
|
417
|
7.71
|
0.1242
|
Chloroform
|
CHCl3
|
119.38
|
0.06964
|
536.6
|
5.47
|
0.2403
|
Dichlorodifluoromethane
(R-12) |
CCl2F2
|
120.91
|
0.06876
|
384.7
|
4.01
|
0.2179
|
Dichlorofluoromethane
(R-21) |
CHCl2F
|
102.92
|
0.08078
|
451.7
|
5.17
|
0.1973
|
Ethane
|
C2H6
|
30.070
|
0.2765
|
305.5
|
4.48
|
0.1480
|
Ethyl alcohol
|
C2H5OH
|
46.07
|
0.1805
|
516
|
6.38
|
0.1673
|
Ethylene
|
C2H4
|
28.054
|
0.2964
|
282.4
|
5.12
|
0.1242
|
Helium
|
He
|
4.003
|
2.0769
|
5.3
|
0.23
|
0.0578
|
n-Hexane
|
C6H14
|
86.179
|
0.09647
|
507.9
|
3.03
|
0.3677
|
Hydrogen (normal)
|
H2
|
2.016
|
4.1240
|
33.3
|
1.30
|
0.0649
|
Krypton
|
Kr
|
83.80
|
0.09921
|
209.4
|
5.50
|
0.0924
|
Methane
|
CH4
|
16.043
|
0.5182
|
191.1
|
4.64
|
0.0993
|
Methyl alcohol
|
CH3OH
|
32.042
|
0.2595
|
513.2
|
7.95
|
0.1180
|
Methyl chloride
|
CH3Cl
|
50.488
|
0.1647
|
416.3
|
6.68
|
0.1430
|
Neon
|
Ne
|
20.183
|
0.4119
|
44.5
|
2.73
|
0.0417
|
Nitrogen
|
N2
|
28.013
|
0.2968
|
126.2
|
3.39
|
0.0899
|
Nitrous oxide
|
N2O
|
44.013
|
0.1889
|
309.7
|
7.27
|
0.0961
|
Oxygen
|
O2
|
31.999
|
0.2598
|
154.8
|
5.08
|
0.0780
|
Propane
|
C3H8
|
44.097
|
0.1885
|
370
|
4.26
|
0.1998
|
Propylene
|
C3H6
|
42.081
|
0.1976
|
365
|
4.62
|
0.1810
|
Sulfur dioxide
|
SO2
|
64.063
|
0.1298
|
430.7
|
7.88
|
0.1217
|
Tetrafluoroethane
(R-134a) |
CF3CH2F
|
102.03
|
0.08149
|
374.2
|
4.059
|
0.1993
|
Trichlorofluoromethane
(R-11) |
CCl3F
|
137.37
|
0.06052
|
471.2
|
4.38
|
0.2478
|
Water
|
H2O
|
18.015
|
0.4615
|
647.1
|
22.06
|
0.0560
|
Xenon
|
Xe
|
131.30
|
0.06332
|
289.8
|
5.88
|
0.1186
|