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
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