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.{{cite book|author=R. C. Weast|title=Handbook of Chemistry and Physics 53rd Edition|url=https://books.google.com/books?id=vyvdSAAACAAJ|year=1972|publisher=Chemical Rubber Pub.}} These constants are generally calculated from the critical pressure $p_c$ and temperature $T_c$ using the formulas $a = \frac{27}{64} \frac{R^2 T_c^2}{p_c}$ and $b = \frac{RT_c}{8p_c}$ .

To convert from $\mathrm{L^2bar/mol^2}$ to $\mathrm{L^2 kPa/mol^2}$ , multiply by 100.

To convert from $\mathrm{L^2bar/mol^2}$ to $\mathrm{m^6 Pa/mol^2}$ , divide by 10.

To convert from $\mathrm{L/mol}$ to $\mathrm{m^3/mol}$ , divide by 1000.

class="wikitable sortable"
! 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{{Cite web \|last=Edge \|first=Engineers \|title=Van der Waals Constants for Gases \|url=https://www.engineersedge.com/thermodynamics/van_der_waals_constants_for_gases_15688.htm \|access-date=2023-04-12 \|website=www.engineersedge.com}} \|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 \|20.94 \|0.1326
2-Butanone \|19.97 \|0.1326
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 \| 0.1424
Cyclopropane \|8.34 \|0.0747
Decane \|52.74 \|0.3043
1-Decanol \|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 \|69.38 \|0.3758
1-Dodecanol \|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 \|4.612 \|0.0582
Fluorine \|1.171 \|0.0290
Fluorobenzene \| 20.19 \| 0.1286
Fluoromethane \| 4.692 \| 0.05264
Freon \| 10.78 \| 0.0998
Furan \|12.74 \|0.0926
Germanium tetrachloride \| 22.90 \| 0.1485
Helium \| 0.0346 \| 0.0238
Heptane \|31.06 \|0.2049
1-Heptanol \|38.17 \|0.2150
Hexane \| 24.71 \| 0.1735
1-Hexanol \|31.79 \|0.1856
Hydrazine \|8.46 \|0.0462
Hydrogen \| 0.2476 \| 0.02661
Hydrogen bromide \| 4.510 \| 0.04431
Hydrogen chloride \| 3.716 \| 0.04081
Hydrogen cyanide \|11.29 \|0.0881
Hydrogen fluoride \|9.565 \|0.0739
Hydrogen iodide \|6.309 \|0.0530
Hydrogen selenide \| 5.338 \| 0.04637
Hydrogen sulfide \| 4.490 \| 0.04287
Isobutane \|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 \|7.106 \|0.0588
Neon \| 0.2135 \| 0.01709
Neopentane \|17.17 \|0.1411
Nitric oxide \| 1.358 \| 0.02789
Nitrogen \| 1.370 \| 0.0387
Nitrogen dioxide \| 5.354 \| 0.04424
Nitrogen trifluoride \|3.58 \|0.0545
Nitrous oxide \| 3.832 \| 0.04415
Octane \|37.88 \|0.2374
1-Octanol \|44.71 \|0.2442
Oxygen \| 1.382 \| 0.03186
Ozone \|3.570 \|0.0487
Pentane \| 19.26 \| 0.146
1-Pentanol \|25.88 \|0.1568
Phenol \|22.93 \|0.1177
Phosphine \| 4.692 \| 0.05156
Propane \| 8.779 \| 0.08445
1-Propanol \|16.26 \|0.1079
2-Propanol \|15.82 \|0.1109
Propene \|8.442 \|0.0824
Pyridine \|19.77 \|0.1137
Pyrrole \|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 \|7.857 \|0.0879
Tetrachloromethane \|20.01 \|0.1281
Tetrachlorosilane \|20.96 \|0.1470
Tetrafluoroethylene \|6.954 \|0.0809
Tetrafluoromethane \|4.040 \|0.0633
Tetrafluorosilane \|5.259 \|0.0724
Tetrahydrofuran \|16.39 \|0.1082
Tin tetrachloride \| 27.27 \| 0.1642
Thiophene \|17.21 \|0.1058
Toluene \| 24.38 \| 0.1463
1-1-1-Trichloroethane \|20.15 \|0.1317
Trichloromethane \|15.34 \|0.1019
Trifluoromethane \|5.378 \|0.0640
Trimethylamine \|13.37 \|0.1101
Water \| 5.536 \| 0.03049
Xenon \| 4.250 \| 0.05105

class="wikitable sortable"

! 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{{Cite web |last=Edge |first=Engineers |title=Van der Waals Constants for Gases |url=https://www.engineersedge.com/thermodynamics/van_der_waals_constants_for_gases_15688.htm |access-date=2023-04-12 |website=www.engineersedge.com}}

|29.14

|0.1486

Argon

| 1.355

| 0.03201

Benzene

| 18.24

| 0.1193

Bromobenzene

| 28.94

| 0.1539

Butane