Collect. Czech. Chem. Commun. 1979, 44, 307-312

Heats of vaporization of nonelectrolytes

Petr Kyselkaa, Jiří Rameša and Karel Procházkab

a Institute of Inorganic Chemistry, Czechoslovak Academy of Sciences, 250 68 Řež
b Department of Physical Chemistry, Charles University, 128 40 Prague 2


The first-order perturbation theory of liquids was used for developing an approximate expression suitable for a rapid calculation of the heat of vaporization of nonpolar liquids formed by approximately spherical molecules. The calculation uses only available physico-chemical properties of substances, namely the critical data. The results are tested by a comparison with existing experimental data on a series of nonpolar substances. The agreement between calculated values and experimental data is relatively good. The maximum deviation between theoretical and experimental values does not exceed ±10%.