Excess molar volumes of ternary-pseudobinary liquid mixtures {benzene + (N,N-dimethylformamide or N,N-dimethylacetamide + CCl4)} and the apparent molar volumes of benzene in the binary mixtures of {N,N-dimethylformamide, or N,N-dimethylacetamide + CCl4} have been obtained by measuring density using an Anton Paar Model DMA 60/602 vibrating-tube densimeter, in the range of dilute concentration. The infinite dilution partial molar volumes of benzene were obtained by extrapolating the mole fraction of benzene to y = 0. The experimental results show that the partial molar volumes at infinite dilution for benzene decrease as the mole fraction x of N,N-dimethylformamide or N,N-dimethylacetamide in pseudo-pure component increases. (C) 2000 Academic Press.