Give the formula that shows the relationship between the boiling point and the enthalpy of evaporation of a solvent.

(N/A) The relationship between the boiling point $(T_b)$ and the enthalpy of vaporization $(\Delta_{vap}H)$ of a solvent is described by Trouton's rule. For many liquids,the entropy of vaporization $(\Delta_{vap}S)$ is approximately constant at the boiling point. The relation is given by: $\Delta_{vap}S = \frac{\Delta_{vap}H}{T_b} \approx 88 \ J \ K^{-1} \ mol^{-1}$.