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From the Wikipedia article (linked to the left of this answer): "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." This value of 87-88 J K-1 mol-1, Trouton's constant, is also about equal to 10.5 * R, where R is the universal gas constant (R = 8.314472 J K-1 mol-1).
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DevinTrouton's constant is a physical property that characterizes the relative volatility of a liquid. It is calculated as the ratio of the heat of vaporization to the boiling point of the liquid at its normal boiling point. Trouton's constant is approximately 21 J/mol·K for most organic liquids.
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