+ n-alkane mixtures at 298.15 K from density and volumetric heat capacity measurements using liquid-flow techniques. The alkanoates selected were n-propyl methanoate, methyl ethanoate, ethyl ethanoate, methyl propanoate, methyl butanoate, methyl pentanoate, and methyl octanoate. p are positive for all systems and rather symmetric. The composition dependence of C; is typically of the o-shaped type with two minima, more or less pronounced, which are separated by a positive part in the case of the more polar esters, i.e. n-propyl methanoate and methyl ethanoate. These results are discussed in terms of possible changes in conformation of both the ester and the n-alkane.

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The excess molar enthalpies of the binary liquid mixtures methyl butanoate + normal alcohol (C4-C10) and propyl ethanoate + normal alcohol (C3-C5) have been determined at atmospheric pressure and 298.15 K as a function of mole fraction. The apparatus used was a standard Calvet microcalorimeter equipped with a device alio wing the exclusión of a vapor phase. The mixtures studied are all highly endothermic (He > 0), and the values of the excess molar enthalpies Increase with length of the hydrocarbon chain of the alcohol. The WE-x curves are practically symmetrical, with maxima at mole fractions of alcohol slightly below 0.5.

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