Second virial coefficients of mixtures of xenon and lower hydrocarbons. 2. Results for Xe + C2Ü4 and theoretical calculations

Measurements of excess Xe + C2H| are reported at eight temperatures between 205 and 273 K. In order to understand the different behavior of ethane and ethene when mixed with xenon, cross second virial coefficients, βn, were theoretically calculated for both mixtures. Following the work of Kohler et al., this binary system Xe + CiH4 and the former one Xe + Citie were modeled as mixtures of spherical molecules (one-center Lennard-Jones, 1CLJ) with linear molecules (two-center Lennard-Jones, 2CLJ); the values of the unlike Lennard-Jones parameters, 12 and a\2, were varied so that the theoretical βn values would give the best fit of the experimental results. The results thus obtained in the gaseous mixtures are compared with previous studies in liquid mixtures.