This paper presents the calculation method allowing one to obtain the matched magnitudes of critical parameters of hydrocarbon gases with an accuracy comparable to the errors of the experimental methods. The ratios obtained allow an assessment of the values of the critical temperature, critical pressure, critical volume, acentric factor, and compressibility in the homologous series of alkanes up to C 100 . The critical parameters for alkanes 4 < n C < 40 calculated using formulas presented in the article demonstrated good consistency with the experimental data. The proposed values of critical constants for normal alkanes can be used to calculate the physiochemical properties of the compounds, while the calculation methods can be used to determine the critical constants of hydrocarbon components of other homologous series.
A novel method for calculating the thermodynamic properties of ternary oxides using borogermanates and germanosilicates as examples is proposed. Using regression coefficients obtained for germanates, borates and silicates, the heat capacity, formation enthalpy, entropy and Gibbs free energy of alkaline borogermanates and germanosilicates were calculated. The obtained enthalpy of formation values are in good agreement with experimental data. In the regression equation, the alkaline oxide thermodynamic potential coefficients were found to depend on the class of compound.
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