Therrnodynamic Studies on Cobalt Complexes. III. Thermal Dissociation of Hexamminecobalt(III) Chloride and Chloropentamminecobalt(III) Chloride

1. The thermal dissociation of hexamminecobalt(III) and chloropentamminecobalt(III) chlorides was studied. The heats of dissociation calculated from the the data of dissociation pressure determined are in good agreement with the values calculated from other sources. 2. The free energy change of dissociation of hexamminecobalt(III) chloride was calculated and by combining this value with the standard free energy of formation of that complex previously obtained, the standard free energy of formation of chloropen tamminecobalt(III) chloride in the solid state was determined. 3. The rate of the thermal dissociation of hexamminecobalt(III) and chloropentamminecobalt(III) chlorides was determined and the activation energies of the dissociation were calculated.