trouton's rule

Question

According to Trouton's rule, the entropy of vaporization (ΔSvap) for most liquids at their normal boiling point is approximately:

RankGuru · Accepted Answer

**Trouton's Rule** is an empirical relation stating that the entropy of vaporization ($\Delta S_{vap} = \frac{\Delta H_{vap}}{T_b}$) is roughly constant for many normal liquids at their boiling point.
- Value: $\approx 88 	ext{ J K}^{-1} 	ext{ mol}^{-1}$ (or about $10.5 R$).
- This signifies that the change in molecular disorder when moving from a liquid to a gas phase is similar for most substances.
- Exceptions occur for liquids with strong intermolecular forces (hydrogen bonding) like water or HF, which have higher values.

Rank Guru

trouton's rule

Select the correct option: