The following table lists the Van der Waals constants (from the Van der Waals equation) for a number of common gases and volatile liquids. These constants are generally calculated from the critical pressure and temperature using the formulas and .
To convert from to , multiply by 100. To convert from to , divide by 10. To convert from to , divide by 1000.
Chemical 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 0.0371Aniline29.140.1486 Argon 1.355 0.03201 Benzene 18.24 0.1193 Bromobenzene 28.94 0.1539 Butane 14.66 0.12261-Butanol20.940.13262-Butanone19.970.1326 Carbon dioxide 3.6 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 0.1424Cyclopropane8.340.0747Decane52.740.30431-Decanol59.510.3086 Diethyl ether 17.61 0.1344 Diethyl sulfide 19.00 0.1214 Dimethyl ether 8.180 0.07246 Dimethyl sulfide 13.04 0.09213Dodecane69.380.37581-Dodecanol75.700.3750 Ethane 5.562 0.0638 Ethanethiol 11.39 0.08098 Ethanol 12.18 0.08407 Ethyl acetate 20.72 0.1412 Ethylamine 10.74 0.08409Ethylene4.6120.0582Fluorine1.1710.0290 Fluorobenzene 20.19 0.1286 Fluoromethane 4.692 0.05264 Freon 10.78 0.0998Furan12.740.0926 Germanium tetrachloride 22.90 0.1485 Helium 0.0346 0.0238Heptane31.060.20491-Heptanol38.170.2150 Hexane 24.71 0.17351-Hexanol31.790.1856Hydrazine8.460.0462 Hydrogen 0.2476 0.02661 Hydrogen bromide 4.510 0.04431 Hydrogen chloride 3.716 0.04081Hydrogen cyanide11.290.0881Hydrogen fluoride9.5650.0739Hydrogen iodide6.3090.0530 Hydrogen selenide 5.338 0.04637 Hydrogen sulfide 4.490 0.04287Isobutane13.320.1164 Iodobenzene 33.52 0.1656 Krypton 2.349 0.03978 Mercury 8.200 0.01696 Methane 2.283 0.04278 Methanol 9.649 0.06702Methylamine7.1060.0588 Neon 0.2135 0.01709Neopentane17.170.1411 Nitric oxide 1.358 0.02789 Nitrogen 1.370 0.0387 Nitrogen dioxide 5.354 0.04424Nitrogen trifluoride3.580.0545 Nitrous oxide 3.832 0.04415Octane37.880.23741-Octanol44.710.2442 Oxygen 1.382 0.03186Ozone3.5700.0487 Pentane 19.26 0.1461-Pentanol25.880.1568Phenol22.930.1177 Phosphine 4.692 0.05156 Propane 8.779 0.084451-Propanol16.260.10792-Propanol15.820.1109Propene8.4420.0824Pyridine19.770.1137Pyrrole18.820.1049 Radon 6.601 0.06239 Silane 4.377 0.05786 Silicon tetrafluoride 4.251 0.05571 Sulfur dioxide 6.803 0.05636Sulfur hexafluoride7.8570.0879Tetrachloromethane20.010.1281Tetrachlorosilane20.960.1470Tetrafluoroethylene6.9540.0809Tetrafluoromethane4.0400.0633Tetrafluorosilane5.2590.0724Tetrahydrofuran16.390.1082 Tin tetrachloride 27.27 0.1642Thiophene17.210.1058 Toluene 24.38 0.14631-1-1-Trichloroethane20.150.1317Trichloromethane15.340.1019Trifluoromethane5.3780.0640Trimethylamine13.370.1101 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