The heat of mixing of some chloro‐alkanes with ethyl ether

The cohesion forces of molecules with an asymmetric distribution of the electrical charge depends on this asymmetry; the dipole moment is not a suitable quantity for the description of cohesion forces, but some other quantity depending on the distance of the charges from the surface. In order to obtain the values of this quantity for a number of molecules, many data on heat of evaporation and heat of mixing are necessary. Therefore we have measured the heat of mixing of chloroform, pentachloroethane and methyl chloroform with ethyl ether at infinite dilution, both of the ether and of the chloro‐alkane. The results confirm the above considerations.