The average enthalpy of sublimation of C60(s) (buckminsterfullerene) over the range 600 to 800 K was determined by allowing the vapor in equilibrium with the solid at a fixed temperature to leak into a mass spectrometer and measuring the integrated intensity I of the C60 peaks. The graph of In (IT/K) versus T‒1 was found to have an average slope of ‒2.18 × 104 K [C. K. Mathews et al., J. Phys. Chem.,96, 3566 (1992)]. The solid’s vapor pressure can be shown to be proportional to IT (see Prob. 14.36). Find ΔsubHm of C60(s) in this temperature range.
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