High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Trouton's rule states that the entropy of vaporization is almost the same value, about 87–88 J K?1 mol?1, for various kinds of liquids. The entropy of vaporization is defined as the ratio between the enthalpy of vaporization and the boiling temperature. It is named after Frederick Thomas Trouton.Trrouton's rule is valid for many liquids; for instance, the entropy of vaporization of toluene is 87.30 J K?1 mol?1, that of benzene is 89.45 J K?1 mol?1, and that of chloroform is 87.92 J K?1 mol?1. Because of its convenience, the rule is used to estimate the enthalpy of vaporization of liquids whose boiling points are known.

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