The equilibrium pressures over C 84 were measured over a large temperature range, 920−1190 K, by the torsion effusion method. The data obtained are well represented by the following selected linear equation: log ( p /kPa) = (7.92 ± 0.30) − (109 50 ± 300)/ T . Considering the vapor phase constituted by only C 84(g), the sublimation standard enthalpy of this compound, Δ sub H °(950) = 210 ± 6 kJ mol -1, as derived by second-law treatment of the experimental data, is proposed.
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Piacente et al. (1997) studied this question.
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