Excess molar volumes (V E) and the speed of sound (u) of binary mixtures of N-methyl-2-pyrrolidone with chloroethanes and ethenes have been measured at 303.15 K. The chloroethanes are 1,2-dichloroethane, 1,1,1-trichloroethane, and 1,1,2,2-tetrachloroethane. The chloroethenes are trichloroethene and tetrachloroethene. The speed of sound data were used to compute isentropic compressibilities (κs) and excess isentropic compressibilities (κs E). V E values are negative over the entire mole fraction range. The κs values are negative over the whole volume fraction range for the systems of N-methyl-2-pyrrolidone with 1,1,1-trichloroethane, 1,1,2,2-tetrachloroethane, and tetrachloroethene and positive for the systems of N-methyl-2-pyrrolidone with 1,2-dichloroethane and trichloroethene.

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The vapor–liquid equilibrium (VLE) and boiling point data have been measured at 95.3 kPa for the binary systems of dimethylsulfoxide (DMSO) with 1,2-dichloroethane, 1,1,1-trichloroethane, 1,1,2,2-tetrachloroethane, trichloroethene, and tetrachloroethene using a Swietoslawski-ebulliometer. The experimental results are analyzed in terms of intermolecular interactions between constituent molecules. The experimental temperature−composition (T, x) data were correlated with the Wilson, NRTL, and UNIQUAC models.