A program has been underway in the Chemical Engineering Department to investigate properties of liquids and solutions; the work presented in this thesis is one part of the program. The objective was to determine the configurational thermodynamic properties of certain substances as a function of liquid density and molecular size and shape, which could be used later in theoretical molecular models for, 1) the configurational properties of pure components as a function of density, and 2) the excess thermodynamic functions for species in solution. [...]