Abstract
The equilibrium pressures over C70 were measured in the temperature range 783−904 K by the torsion effusion and Knudsen effusion methods. The obtained data are well represented by the following selected equation: log(p/Pa) = (11.38 ± 0.15) − (9917 ± 160)/(T/K). Assuming the vapor phase constituted by only C70(g), the sublimation standard enthalpy of this compound, ΔsubH°(298) = 200 ± 6 kJ mol-1, as derived by second law elaboration of the experimental data, was derived. From the vapor pressure data, an evaluation of the free energy functions for solid C70 has been made. The heat of formation of gaseous C70, ΔforH°(298) = 2755 ± 18 kJ mol-1, was also derived.
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