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3 Polish Journal of Chemistry

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Compressibility Data and Virial Coefficients for Helium - Nitrogen Mixtures

Korfall O., Parlak B.

Polish Journal of Chemistry

2007

Vol. 81, nr 9

1629-1639

A detailed experimental study of the pressure and density of He - N2 mixtures at 0°C, 25.0°C and 50.0°C is reported. The pressures are measured with a dead-weight tester. The densities are determined from knowledge of the precise volume and weight measurement of the mixtures. Statistical analysis of the experimental data yielded very precise values for the second and third density virial coefficients. Experimentally determined virial coefficients are compared with those of the literature. Un like interaction second virial coefficients, B12, are determined from the mixture virial coefficients by using the like interaction virial coefficients, B11 and B22, of the pure components. The deduced B12 values agree very well with those computed from potential functions with quantum corrections.

Compressibility Data and Virial Coefficients for Nitrogen-Argon Mixtures

Korfali O.

Polish Journal of Chemistry

2006

Vol. 80, nr 9

1541-1557

We present a detailed experimental study of the pressure and density ofN2-Ar mixtures at 0°C, 25.0°C and 50.0°C with four different mixtures at each temperature. The pressures are measured with a dead-weight tester. The densities are determined from knowledge of the precise volume and weight measurement of the mixtures. Statistical analysis of the experimental data yielded very precise values for the second and third density virial coefficients. Finally experimentally determined virial coefficients are compared with those calculated on the basis of statistical mechanics. The maximum percentage deviation between experimental and theoretical second virial coefficients is about 10% and that between third virial coefficients is less than 1%.

The State Dependency of the Effective Pair Potential Parameters

Keshavarzi E., Hashemi F., Ghazvini Z.

Polish Journal of Chemistry

2004

Vol. 78 / nr 10

1893-1906

The state dependency of the effective pair potential parameters [epsilon eff (T,ro ), sigma eff (T)] has been studied for gas, liquid and supercritical regions for different types of fluids.We have assumed that the configuration of potential energy between Nmolecules can be divided into independent pair clusters with an effective pair potential, in which the parameters of the potential are state dependent.We have obtained the values of epsilon eff (T, ro),and sigma eff (T) using p-V-T data. The results show, that epsilon eff (T, ro) increases with density for those thermodynamic states, at which pair interactions are dominant, while it decreases with density for those systems, where triplet and higher clusters are dominant. Both epsilon eff (T, ro) and sigma eff (T) decrease with temperature, which coincides with the literature data. Aremarkable result of the present work is the determination of density, at which triplet clusters come into account. We have also shown new corresponding states for the effective well depth parameter, which is held for all examined fluids, including Ar, Xe, CH4, N2, CO, H2O, CO2, CH3OH, C2H6 and C6H6 for different isotherms. Alinear dependence of epsilon eff (T, ro) versus density and temperature on the zeno-line is predicted.