Mixtures containing a polar component and an alkane show a transitional behaviour between non‐associated and associated mixtures. The excess enthalpy and the excess Gibbs energy can be described by the quasichemical approximation with a temperature dependent interchange parameter. The excess entropy is given by SE = SconfE + SINTE. The first term is due to the non‐randomness of the mixture. The second term is correlated to HE. Using this correlation GE, HE and TSE can be roughly predicted. — Excess enthalpies and vapor pressure data were measured in order to supplement excess property data.

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