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Excess molar volumes (yE) for binary mixtures containing acetonitrile and a 1-alkanol ((^-0$) measured dllatometrlcally at 308.15 K are reported over the entire range of compositions. Equimolar excess volumes Increase linearly with Increase In the number of carbon atoms In the hydrocarbon chain. The Ve-x curve Is skewed toward low acetonitrile mole fraction for ethanol to 1-pentanol. The results are rationalized In terms of the physical and specific Interactions in these mixtures.