b → adjusts for the volume occupied by the gas particles.
The table below shows that the van der Waals b parameter has units of L/mol.
Van der Waals Constants for Gas Molecules | ||
Substance | a(L2-atm/mol2) | b(L/mol) |
He | 0.0341 | 0.02370 |
Ne | 0.211 | 0.0171 |
Ar | 1.34 | 0.0322 |
Kr | 2.32 | 0.0398 |
Xe | 4.19 | 0.0510 |
H2 | 0.244 | 0.0266 |
N2 | 1.39 | 0.0391 |
O2 | 1.36 | 0.0318 |
F2 | 1.06 | 0.0290 |
Cl2 | 6.49 | 0.0562 |
H2O | 5.46 | 0.0305 |
NH3 | 4.17 | 0.0371 |
CH4 | 2.25 | 0.0428 |
CO2 | 3.59 | 0.0427 |
CCl4 | 20.4 | 0.1383 |
This means that we can calculate the sizes of atoms or molecules from the b parameter. Refer back to the discussion in Section 7.3 in the textbook.
Is the van der Waals radius we calculate from the b parameter of the table above more closely associated with the bonding or nonbonding atomic radius discussed there?
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