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,
Δsub
H°(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,
Δfor
H°(298) = 2755 ±
18 kJ mol-1, was also derived.
The vapor pressure of lindane was measured by torsion and
Knudsen-effusion methods over the
temperature range 310 K to 384 K. The following
temperature−pressure equation was obtained: log(p/kPa) = 11.23 ± 0.50 − (4832 ±
150)(K/T). From the vapor pressure data, the
second-law sublimation
enthalpy of this compound, Δsub
H°(298
K) = (92 ± 4) kJ·mol-1, was
derived. The results were compared
with literature values.
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