A method for the accurate calculation of some thermodynamic properties of non-polar or moderately polar substances, based on Van Laar's theory

Autor:	W. Heukelom
Rok vydání:	2010
Předmět:	symbols.namesake Equation of state Boiling point Tension (physics) Chemistry symbols Thermodynamics Polar Non polar General Chemistry van der Waals force Constant (mathematics) Order of magnitude
Zdroj:	Recueil des Travaux Chimiques des Pays-Bas. 68:661-695
ISSN:	0165-0513
DOI:	10.1002/recl.19490680709
Popis:	Van Laar's method to calculate the critical conditions is based on the molecular constants a and b in van der Waals' equation of state. In certain cases inaccuracies in the calculated values of a may lead to results which deviate considerably from the experiment. In the present article it is demonstrated that the accuracy may be increased to a considerable extent by replacing the constant a in the calculations by less fundamental magnitudes, such as the boiling point and the vapour tension factor. It is found that in the latter case the probable error is of the same order of magnitude as the experimental error. An extensive survey is given of the results for several substances of different structural types. A brief survey is given of some further data which can be calculated from the results obtained.
Databáze:	OpenAIRE
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