Vapour pressures and standard molar enthalpies of sublimation of four crystalline β-diketones

Abstract

The Knudsen mass-loss effusion technique was used to measure the vapour pressure as a function of temperature for four crystalline β-diketones. From the temperature dependence of the vapour pressure, the standard molar enthalpies of sublimation δgcrH°m(Tm) at the mean temperature Tm of the experimental temperature range were derived, and the standard molar enthalpies of sublimation, at temperature 298.15 K, were calculated: Download : Download full-size image