Relative Magnitude
Dispersion forces are usually dominant of the three van der Waals forces (orientation, induction, dispersion) between atoms and molecules, with the exception for molecules that are small and highly polar, like of water. The following contribution of the dispersion to the total intermolecular interaction energy has been given:
| Molecule pair | % of the total energy of interaction |
|---|---|
| Ne-Ne | 100 |
| CH4-CH4 | 100 |
| HCl-HCl | 86 |
| HBr-HBr | 96 |
| HI-HI | 99 |
| CH3Cl-CH3Cl | 68 |
| NH3-NH3 | 57 |
| H2O-H2O | 24 |
| HCl-HI | 96 |
| H2O-CH4 | 87 |
Read more about this topic: London Dispersion Force
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