It can then be assumed that the partial mole volume of carbon dioxide, [bar.[V.sub.2]], is close to the partial mole volume under infinite dilution, [V.sup.[infinity].sub.2], and that it is independent of pressure.
Here, it was assumed that the partial molar volume of the solvent, [bar.[V.sub.1]], is close to the mole volume of pure solvent, [V.sub.1], and independent of pressure.