Van der Waals constants (data page)

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 ${\displaystyle L^{2}bar/mol^{2}}$ to ${\displaystyle L^{2}kPa/mol^{2}}$, multiply by 100.

	a (L^2bar/mol^2)	b (L/mol)
Acetic acid	17.71	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
Argon	1.355	0.03201
Benzene	18.24	0.1193
Bromobenzene	28.94	0.1539
Butane	14.66	0.1226
Carbon dioxide	3.640	0.04267
Carbon disulfide	11.77	0.07685
Carbon monoxide	1.505	0.03985
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
Diethyl ether	17.61	0.1344
Diethyl sulfide	19.00	0.1214
Dimethyl ether	8.180	0.07246
Dimethyl sulfide	13.04	0.09213
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
Fluorobenzene	20.19	0.1286
Fluoromethane	4.692	0.05264
Freon	10.78	0.0998
Germanium tetrachloride	22.90	0.1485
Helium	0.0346	0.0238
Hexane	24.71	0.1735
Hydrogen	0.2476	0.02661
Hydrogen bromide	4.510	0.04431
Hydrogen chloride	3.716	0.04081
Hydrogen selenide	5.338	0.04637
Hydrogen sulfide	4.490	0.04287
Iodobenzene	33.52	0.1656
Krypton	2.349	0.03978
Mercury	8.200	0.01696
Methane	2.283	0.04278
Methanol	9.649	0.06702
Neon	0.2135	0.01709
Nitric oxide	1.358	0.02789
Nitrogen	1.370	0.0387
Nitrogen dioxide	5.354	0.04424
Nitrous oxide	3.832	0.04415
Oxygen	1.382	0.03186
Pentane	19.26	0.146
Phosphine	4.692	0.05156
Propane	8.779	0.08445
Radon	6.601	0.06239
Silane	4.377	0.05786
Silicon tetrafluoride	4.251	0.05571
Sulfur dioxide	6.803	0.05636
Tin tetrachloride	27.27	0.1642
Toluene	24.38	0.1463
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 = .101325 J·m³/mol² = 0.101325 Pa·m⁶/mol²

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

References

1. R. C. Weast (1972). Handbook of Chemistry and Physics 53rd Edition. Chemical Rubber Pub.