LIQUID-MIXTURES INVOLVING CYCLIC MOLECULES - XENON PLUS CYCLOPROPANE

The total vapor pressure of liquid mixtures of xenon and cyclopropane has been measured at 161.39 K (the triple-point of xenon) and at 182.3 3 K (the triple-point of dinitrogen oxide), as a function of compositi on. At 182.33 K the liquid densities were also measured. The mixtures show positive deviations from Raoult's law. Both the excess molar Gibb s energy (G(m)(E)) and the excess molar volume (V-m(E)) were calculate d from the experimental data. For the equimolar mixture, G(m)(E) = 90. 6 J mol(-1) at 161.39 K, G(m)(E) = 124.1 J mol(-1) at 182.33 K, and VE mE = -0.758 cm(3) mol(-1) at 182.33 K. The excess molar enthalpy (H-m( E)) could be estimated from the temperature dependence of G(m)(E) and found to be -168 J mol(-1). The results were interpreted using the 1cL J perturbation theory of Fisher et al.