Here are some data for constants a and b appearing in the van der Waals equation:
| Gas | Formula | a (atm L2/mol2) | b (L/mol) |
|---|---|---|---|
| Acetylene | C2H2 | 4.390 | 0.05136 |
| Ammonia | NH3 | 4.170 | 0.03707 |
| Carbon dioxide | CO2 | 3.592 | 0.04267 |
| Ethane | C2H6 | 5.489 | 0.0638 |
| Ethylene | C2H4 | 4.471 | 0.05714 |
| Helium | He | 0.03508 | 0.0237 |
| Hydrogen | H2 | 0.244 | 0.0266 |
| Hydrogen chloride | HCl | 3.667 | 0.04081 |
| Krypton | Kr | 2.318 | 0.03978 |
| Mercury | Hg | 8.093 | 0.01696 |
| Methane | CH4 | 2.253 | 0.0428 |
| Neon | Ne | 0.2107 | 0.01709 |
| Nitric oxide | NO | 1.340 | 0.02789 |
| Nitrogen | N2 | 1.390 | 0.03913 |
| Nitrogen dioxide | NO2 | 5.284 | 0.04424 |
| Oxygen | O2 | 1.360 | 0.03183 |
| Propane | C3H8 | 8.664 | 0.08445 |
| Sulfur dioxide | SO2 | 6.714 | 0.05636 |
| Xenon | Xe | 4.194 | 0.05105 |
| Water | H2O | 5.464 | 0.03049 |
Please, be aware of the units.
Any question? Write in the comments and I shall try to help.
Other stuff of interest
- Understanding the law of Boyle
- Measuring atmospheric pressure
- Some examples of temperature instruments
- Minor losses - Formulas
- What is a process variable?
- What are the most important process variables?
- Time dependence of process variables
- A list of process variables
- Composition variables for mixtures
Ildebrando.
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