In a study of the vapour pressure of chloromethane, A. Bah and N. Dupont-Pavlovsky (J. Chem. Eng. Data 40, 869 (1995)) presented data for the vapour pressure over solid chloromethane at low temperatures. Some of that data is as follows: 

Estimate the standard enthalpy of sublimation of chloromethane at 150K. (Take the molar volume of the vapour to be that of a perfect gas, and that of the solid to be negligible.)

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T/K p/Pa 145.94 13.07 147.96 18.49 149.93 151.94 25.99 36.76 153.97 50.86 154.94 59.56