A model of the temperature dependence of the vapour pressure and the heat of vaporization of associated liquids whose vapours contain associates is presented for two cases: dimers and linear associates in the gas phase. The results are analytic generalizations of the Clausius-Clapeyron equation, valid with accuracy of 0.1-1%, as demonstrated with 11 liquids: formic and acetic acids, methanol, ethanol, n-propanol, n-butanol, water, benzene, toluene, heptane, and isooctane. The model involves only readily available handbook parameters: the room-temperature vaporization heat, vapour pressure, heat capacities, 2 nd virial coefficient, and heat of dissociation of the dimers in the gas phase.