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The heat of formation of titanium trichloride has been determined by measuring the heats of solution of TiCh(l) and TiCl3-(s) in a solvent of HCl-FeCl3 in an ice calorimeter. The heat of formation of the trichloride is based upon the heat of formation for TiCl4(l) of -192.1 ± 0.6 kcal./mole. The value obtained for the heat of formation of TiCl3(s) at 298°K. is -172.2 ± 0.7 kcal./mole. THERMODYNAMICSOF THE TITANIUM CHLORIDES. II. HEAT OF FORMATION OF TITANIUM DICHLORIDE1

The viscosity. of krypton has be~n m.easured over the temperature range 297° to 666°K by the oscillating disk method usmg helium for calibration. The viscosities obtained were used to get the parameters for a Lennard-Jones 12-6 potential function and they were found to be o/k= 162°K and u=3.734 A. Calculation of the viscosity, thermal conductivity, self-diffusion coefficient, second virial coefficients in the moderate temper~ture ran?e, and the heat of sublimation at OOK from the L. J. 12-6 function gives very good agreement with expen~ent~l values. Calculated v~lues for the second virial coefficient at low temperatures, the reduced thermal dIffusIOn factor, and the lattice spacing at OOK are in fair agreement with experiment.

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