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.
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)
Source: Weast. R. C. (Ed.), Handbook of Chemistry and Physics (53rd Edn.), Cleveland:Chemical Rubber Co., 1972.
| a (L2bar/mol2) | 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 | 4.170 | 0.0371 |
| Argon | 1.355 | 0.03201 |
| Benzene | 18.24 | 0.1154 |
| 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 |
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