The densities and viscosities for binary mixtures of vitamin K-3 + benzene, toluene, ethylbenzene, o-xylene, m.-xylene, and p-xylene, respectively, have been determined experimentally under normal atmospheric pressure over the entire molality range from (303.15 to 333.15) K. The apparent molar volumes of vitamin K3 were calculated from experimental measurements. Results were fit to obtain the appropriate parameters and standard deviations between the measured and fitted values.