ISSN:
1572-8927
Keywords:
Apparent molar volumes
;
vapor-liquid equilibria
;
aqueous nonelectrolytes
;
equations of state
;
near-critical region
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Apparent molar volumes of aqueous solutions of argon and xenon have been calculated using a previously developed comprehensive equation of state for nonelectrolyte systems. The equation consists of a virial expansion truncated after the fourth virial coefficient and a closed-form term approximating higher coefficients. Mixing rules are based on the composition dependence of virial coefficients, which is known from statistical mechanics. The equation accurately represents vapor-liquid and gas-gas equilibria for the Ar+H2O and Xe+H2O systems over wide ranges of pressure and temperature using two binary parameters. With the binary parameters determined from phase equilibrium data, the equation accurately predicts apparent molar volumes Vϕ in the near-critical and far-from-critical regions. Apart from reproducing experimental Vϕ data, the equation reveals remarkable maxima of Vϕ as a function of pressure and temperature in the near-critical region. The implications of this equation with respect to the Ar−H2O potential are discussed via the second virial coefficient.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00647209
Permalink
