Densities and excess molar volumes, VE, Of pentan-3-one + 1,2-dichloroethane, +1,3-dichloropropane, +1,4-dichlorobutane, +trichloromethane, + I,1,l-trichloroethane, + 1,1,2,2-tetrachloroethane are presented at 298.15 K and atmospheric pressure over the whole composition range. These measurements were performed in order to complement the data on VLE [M. Teodorescu, A. Barhala, O. Landauer, ELDATA : Int. Electron. J.. Physico-Chem. Data 3 (1997) 101-108; M. Teodorescu, K. Aim, I. Wichterle, Fluid Phase Equilibria, in press] and to investigate the influence of molecular structure of these chloroalkanes on V-E in their mixtures with pentan-3-one. At this temperature, V-E was found to be slightly positive at high mole fractions and slightly negative at low mole fractions of 1,2-dichloroethane in case of the first system. For all the other systems, V-E was negative. The V-E experimental results were correlated using the fourth-order Redlich-Kister equation, and the maximum likelihood procedure was applied for evaluating the adjustable parameters.