The fractionation of ' 3C between CO?(g) and COs'--HCOs-(aq) in solution has been studied in single stage experiments using carbonic anhydrase to catalyze the hydration of CO?. Added metal ions, pH of the equilibrium mixture, and temperature are found to play important roles in the overall fractionation process. Theoretical evaluation of the 13CO?(g)--12C03=(aq) equilibrium constant (K?) has been made using the most recent spectroscopic data on the exchanging species. The variation of the equilibrium constant K? with temperature has been calculated for each 25 deg interval from 0 to 975 OC with the help of the MclMaster University I B M 7040 computer.
=-8.0 kcal./mole. Combining this value with the dissociation energy of oxygen and our heat of sublimation of thorium metal yields a dissociation heat at 1883°K. for ThO(g) of +200.0 kcal./mole corresponding to Z)0°(ThO) = 196.1 kcal./mole. This is to be compared with Brewer's30 estimated value of 200 ± 20 kcal./mole.Further work on the reaction of thorium with thorium dioxide and with oxygen is in progress.
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