Abstract
P–V–T–X relationships for the water–methane, water–n-pentane, water–n-hexane, water–n-heptane, and water–n-octane systems are derived by piezometry at a constant volume in the vicinity of the critical point of water (647.096 K) and up to 673.15 K at pressures up to 40 MPa and alkane mole fractions of 0–1.0. Conditions are determined under which real mixtures behave as an ideal gas or have a constant compressibility factor. It is demonstrated that the concentration dependence of the partial molar volumes of alkanes in the range of small concentrations is asymptotic if the isothermal isobar of the solvent is critical. The molecular parameters of the equation of state that is based on perturbed-hard-chain theory are determined and used in the calculation of thermodynamic parameters for this class of solutions.
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