NPT Monte Carlo simulations of racemic mixtures were performed on a simplified model for the enantiomers. The molecules were spheres of equal size, interacting via a modified LennardJones potential. The interaction strength and the optimum distance between heterochiral molecules (D and L) differed (by a factor e and a factor s, respectively) from the homochiral values (D and D or L and L). Chemical potentials, enthalpies and orientational bond order parameters Q l were calculated for a lot of racemic liquid mixtures. Weak heterochiral interactions (e 1 both had a negative excess entropy, showing ordering. This effect was outweighed by a large negative excess enthalpy, and in total they had a negative excess Gib...