Fluorine bomb calorimetry. Part 14.—Enthalpies of formation of the hexafluorides of sulphur, selenium, and tellurium and their thermodynamic properties to 1500°K

Abstract

The energies of formation of the hexafluorides of sulphur, selenium, and tellurium were measured by direct combination of the elements in a bomb calorimeter. From these measurements the standard enthalpies of formation ΔH^°_f298·15(g), were calculated (in kcal mole^–1) : SF₆, –291.7₇±0.2₄; SeF₆, –266.9₅±0.1₄; TeF₆, –327.2₀±0.5₆. These values are substantially more negative then those reported by Yost and Claussen in 1933. The thermodynamic properties of these compounds have been computed and tabulated from 0 to 1500°K.