Van der Waals constants (data page)

Short description: Table of constants for a list of gases and volatile liquids

The following table lists the Van der Waals constants (from the Van der Waals equation) for a number of common gases and volatile liquids.[1]

To convert from L2bar/mol2 to L2kPa/mol2, multiply by 100.
To convert from L2bar/mol2 to m6Pa/mol2, divide by 10.
To convert from L/mol to m3/mol, divide by 1000.

| a (L2bar/mol2)  | b (L/mol)

|
|

Acetic acid | 17.7098  | 0.1065
Acetic anhydride | 20.158  | 0.1263
Acetone | 16.02  | 0.1124
Acetonitrile | 17.81  | 0.1168
Acetylene | 4.516  | 0.0522
Ammonia | 4.225  | 0.0371
Aniline[2] | 29.14  | 0.1486
Argon | 1.355  | 0.03201
Benzene | 18.24  | 0.1193
Bromobenzene | 28.94  | 0.1539
Butane | 14.66  | 0.1226
1-Butanol[2] | 20.94  | 0.1326
2-Butanone[2] | 19.97  | 0.1326
Carbon dioxide | 3.640  | 0.04267
Carbon disulfide | 11.77  | 0.07685
Carbon monoxide | 1.505  | 0.0398500
Carbon tetrachloride | 19.7483  | 0.1281
Chlorine | 6.579  | 0.05622
Chlorobenzene | 25.77  | 0.1453
Chloroethane | 11.05  | 0.08651
Chloromethane | 7.570  | 0.06483
Cyanogen | 7.769  | 0.06901
Cyclohexane | 23.11  | 0.1424
Cyclopropane[2] | 8.34  | 0.0747
Decane[2] | 52.74  | 0.3043
1-Decanol[2] | 59.51  | 0.3086
Diethyl ether | 17.61  | 0.1344
Diethyl sulfide | 19.00  | 0.1214
Dimethyl ether | 8.180  | 0.07246
Dimethyl sulfide | 13.04  | 0.09213
Dodecane[2] | 69.38  | 0.3758
1-Dodecanol[2] | 75.70  | 0.3750
Ethane | 5.562  | 0.0638
Ethanethiol | 11.39  | 0.08098
Ethanol | 12.18  | 0.08407
Ethyl acetate | 20.72  | 0.1412
Ethylamine  | 10.74  | 0.08409
Ethylene[2] | 4.612  | 0.0582
Fluorine[2] | 1.171  | 0.0290
Fluorobenzene | 20.19  | 0.1286
Fluoromethane | 4.692  | 0.05264
Freon | 10.78  | 0.0998
Furan[2] | 12.74  | 0.0926
Germanium tetrachloride | 22.90  | 0.1485
Helium | 0.0346  | 0.0238
Heptane[2] | 31.06  | 0.2049
1-Heptanol[2] | 38.17  | 0.2150
Hexane | 24.71  | 0.1735
1-Hexanol[2] | 31.79  | 0.1856
Hydrazine[2] | 8.46  | 0.0462
Hydrogen | 0.2476  | 0.02661
Hydrogen bromide | 4.510  | 0.04431
Hydrogen chloride | 3.716  | 0.04081
Hydrogen cyanide[2] | 11.29  | 0.0881
Hydrogen fluoride[2] | 9.565  | 0.0739
Hydrogen iodide[2] | 6.309  | 0.0530
Hydrogen selenide | 5.338  | 0.04637
Hydrogen sulfide | 4.490  | 0.04287
Isobutane[2] | 13.32  | 0.1164
Iodobenzene | 33.52  | 0.1656
Krypton | 2.349  | 0.03978
Mercury | 8.200  | 0.01696
Methane | 2.253  | 0.04278
Methanol | 9.649  | 0.06702
Methylamine[2] | 7.106  | 0.0588
Neon | 0.2135  | 0.01709
Neopentane[2] | 17.17  | 0.1411
Nitric oxide | 1.358  | 0.02789
Nitrogen | 1.370  | 0.0387
Nitrogen dioxide | 5.354  | 0.04424
Nitrogen trifluoride[2] | 3.58  | 0.0545
Nitrous oxide | 3.832  | 0.04415
Octane[2] | 37.88  | 0.2374
1-Octanol[2] | 44.71  | 0.2442
Oxygen | 1.382  | 0.03186
Ozone[2] | 3.570  | 0.0487
Pentane | 19.26  | 0.146
1-Pentanol[2] | 25.88  | 0.1568
Phenol[2] | 22.93  | 0.1177
Phosphine | 4.692  | 0.05156
Propane | 8.779  | 0.08445
1-Propanol[2] | 16.26  | 0.1079
2-Propanol[2] | 15.82  | 0.1109
Propene[2] | 8.442  | 0.0824
Pyridine[2] | 19.77  | 0.1137
Pyrrole[2] | 18.82  | 0.1049
Radon | 6.601  | 0.06239
Silane | 4.377  | 0.05786
Silicon tetrafluoride | 4.251  | 0.05571
Sulfur dioxide | 6.803  | 0.05636
Sulfur hexafluoride[2] | 7.857  | 0.0879
Tetrachloromethane[2] | 20.01  | 0.1281
Tetrachlorosilane[2] | 20.96  | 0.1470
Tetrafluoroethylene[2] | 6.954  | 0.0809
Tetrafluoromethane[2] | 4.040  | 0.0633
Tetrafluorosilane[2] | 5.259  | 0.0724
Tetrahydrofuran[2] | 16.39  | 0.1082
Tin tetrachloride | 27.27  | 0.1642
Thiophene[2] | 17.21  | 0.1058
Toluene | 24.38  | 0.1463
1-1-1-Trichloroethane[2] | 20.15  | 0.1317
Trichloromethane[2] | 15.34  | 0.1019
Trifluoromethane[2] | 5.378  | 0.0640
Trimethylamine[2] | 13.37  | 0.1101
Water | 5.536  | 0.03049
Xenon | 4.250  | 0.05105

## Units

1 J·m3/mol2 = 1 m6·Pa/mol2 = 10 L2·bar/mol2

1 L2atm/mol2 = 0.101325 J·m3/mol2 = 0.101325 Pa·m6/mol2

1 dm3/mol = 1 L/mol = 1 m3/kmol = 0.001 m3/mol (where kmol is kilomoles = 1000 moles)

## References

1. ↑ R. C. Weast (1972). Handbook of Chemistry and Physics 53rd Edition. Chemical Rubber Pub.. https://books.google.com/books?id=vyvdSAAACAAJ.
2. ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 2.15 2.16 2.17 2.18 2.19 2.20 2.21 2.22 2.23 2.24 2.25 2.26 2.27 2.28 2.29 2.30 2.31 2.32 2.33 2.34 2.35 2.36 2.37 2.38 2.39 2.40 2.41 2.42 2.43 Edge, Engineers. "Van der Waals Constants for Gases". https://www.engineersedge.com/thermodynamics/van_der_waals_constants_for_gases_15688.htm.

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