The vapor pressures of three 4-substituted acetanilide derivatives (namely, 4-ethoxyacetanilide, 4-hydroxyacetanilide and 4-bromoacetanilide) were measured above their liquids using the mass loss rates determined by thermogravimetry under both isothermal and nonisothermal diffusion-controlled conditions. The coefficient used to convert mass loss rates in vapor pressures showed a slight increase with increasing temperature. Therefore, the small deviations observed from the mean value enable the use of a single calibration value to be considered reasonable. From the temperature dependence of the vapor pressure estimated using a calibration constant for each technique the molar enthalpies of vaporization Delta H-g(l)degrees(m)(< T >) were determined, respectively, at the middle < T > of the respective temperature intervals. The melting temperatures and the molar enthalpies of fusion of these compounds were measured by differential scanning calorimetry. Finally, the standard molar enthalpies of sublimation Delta H-g(cr)degrees(m)(298.15 K) were obtained at the reference temperature of 298.15 K using the standard molar enthalpies of vaporization Delta H-g(l)degrees(m)(< T >), the molar enthalpies of fusion. the heat capacity differences between gas and liquid and the heat capacity differences between gas and solid, Delta C-g(l)degrees(p.m) and Delta C-g(cr)degrees(p.m), respectively, both estimated by applying a group additivity procedure. Therefore. the averages of the standard (p degrees = 0.1 MPa) molar enthalpies, entropies and Gibbs energies of sublimation at 298.15 K, have been derived: [GRAPHICS] (C) 2009 Elsevier B.V. All rights reserved.