Francesconi, Lunelli, and Comelli studied the liquid–vapour equilibria of trichloromethane and 1,2-epoxybutane at several temperatures (Francesconi et al., J. Chem. Eng. Data 41, 310 (1996)). Among their data are the following measurements of the mole fractions of trichloromethane in the liquid phase (x_T) and the vapour phase (y_T) at 298.15K as a function of pressure.

Compute the activity coefficients of both components on the basis of Raoult’s law.

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p/kPa 23.40 21.75 20.25 18.75 18.15 20.25 22.50 26.30 0 0.129 0.228 0.353 0.511 0.700 0.810 1 0 0.065 0.145 0.285 0.535 0.805 0.915 1 x y