Van Laar and Lorenz established a relation which allows one to calculate the heat of “mixing with zero volume change”. We have extended their result to the mixing of normal alkanes, which is accompanied by a contraction, by interpreting the factor a of the van der Waals equation and by supposing that a pure normal paraffin may be considered for this purpose as a mixture of CH3 and CH2 molecules.
H. F. Stoeckli, J. G. Fernández-García and Ch. G. Boissonnas, Trans. Faraday Soc., 1966, 62, 3044 DOI: 10.1039/TF9666203044
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