Densities, , and ultrasonic speeds, of mixtures of 1-butanol or iso-butanol or t-butanol with equimolar mixture of (N,N-dimethylacetamide + Ethyl acrylate) over the entire composition range have been measured at ？K. Using the experimental results, deviation in ultrasonic speed, , deviation in isentropic compressibility, , excess molar volume, , excess intermolecular free length, , and excess acoustic impedance, , have been calculated. The variation of these properties with composition of the mixtures has been discussed in terms of molecular interactions in these mixtures. The deviation/excess properties have been fitted to Redlich-Kister type polynomial and the corresponding standard deviations have been calculated. Negative values of , , and and positive values of , and are observed over the entire composition range. The observed negative and positive values of deviation/excess properties are attributed to the strong interactions between the unlike molecules of the mixtures. Further theoretical values of sound velocity in the mixtures have been evaluated using various theories and compared with experimental sound velocities to verify the applicability of such theories to the systems studied. Theoretical ultrasonic velocity data has been used to study molecular interactions in the systems investigated. 1. Introduction The measurement of speed of sound in liquids enables for the determination of some useful acoustic and thermodynamic parameters that are found to be very sensitive to molecular interactions. Acrylic esters are important industrial chemicals that are widely used as precursors in the production of technically important special type polymers. Alkanol molecules are polar and self-associated through hydrogen bonding of their hydroxyl groups [1]. N,N-dimethylacetamide is commonly used as a solvent for fibres or in the adhesive industry. Ethyl acrylate and N,N-dimethylacetamide molecules are polar having dipole moments 1.96？D [2] and 3.72 D [2] at 298.15？K, respectively. A survey of the literature indicates that Francesconi and Comelli [3], Gonzalez and Ortega [4], and Liau et al. [5] reported density and viscosity data for binary mixtures of esters with alkanols. Recently some researchers have reported the ultrasonic, volumetric, and viscometric studies of esters with alcohols [6–8]. N,N-dimethylacetamide as one component and +2-propoxyethanol, +2-isopropoxyethanol [9] and +aliphatic alcohols [10, 11], and +benzene, +toluene, +ethyl benzene [12] as other components. Literature survey indicates that there have been no studies on these equimolar
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