DILUTE NEAR-CRITICAL SOLUTIONS OF IODINE IN XENON - DETERMINATION OF V-2(INFINITY), S-2(INFINITY) AND (PARTIAL-DERIVATIVE-P PARTIAL-DERIVATIVE-X)V-INFINITY,T FROM SOLUBILITY DATA/

Using recently determined solubility data for solid iodine dissolved i n near-critical xenon, we have calculated the partial molar entropy an d volume of the solute. These quantities show a strong density depende nce in the vicinity of the solvent critical point. The quantity (parti al derivative p/partial derivative x)V,T, which does not show a strong divergence in the critical region, was also determined from experimen tal data. Two procedures have been employed to describe the latter qua ntity and the solubility itself. It is shown that a first order pertur bation method may be employed to describe the observed behaviour with a cross intermolecular energy parameter, epsilon12, which, for low den sities becomes dependent on the fluid density, but not on the temperat ure. The PYLJ integral theory is shown to account very well for the da ta with the value of epsilon12 obtained employing the Lorentz-Berthelo t combining rule.