Self-Diffusion of Carbon Tetrachloride, Isobars and Isochores

Abstract

The self‐diffusion coefficient of CCl₄ has been measured over a range of temperature between 25° and 50°C and at 1 and 200 atmospheres. The results can be expressed by the equations: for 1 atmos, D=325 exp (—3300/RT), for 200 atmos, D=264 exp (—3300/RT). The activation energy for constant volume is 1070 Cal. These activation energies are identical with those previously found for the diffusion of I₂ in CCl₄. The temperature coefficient of diffusion at constant volume parallels in both cases the increase of kinetic energy. Dη/T is constant within 7 percent in the range studied, where η denotes viscosity. These results are discussed in relation to various theories for the mechanism of diffusion.