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If eo < kT, then the high rotational and vibrational where this has been put in a form to resemble equastates become unimportant, and the upper limits for tions 19,25 and 32. Figure 3 shows K as calculated the sums can be taken as infinite with very little by equation 32 displayed with K as calculated by error. I n this case, the expressions for the partition equation 36. It can be Seen that they join quite functions are the usual ones, given in equations 7Acknowledgments.-I wish to thank Professors 2 2. Hugus and Rufus Lumry for helpful discusand 11, and the equilibrium constant is e(ro-rv/2)/kT sions. This work was sponsored in part by the Office of Ordnance Research, U. S. Army, in the neighborhood Of = kT* T S / p (%)"* 2 (1 -e-w/KT) (36) k ' 2 3uA study of the reaction between fluorine gas and hydrogen-methane mixtures has been made over a temperature range from 25-150" in both inconel and quartz reaction vessels. The kinetics are complicated by surface effects but may reasonably be inter reted in terms of a chain mechanism in which the rate-determining steps are F + HZ --c HF + H (1) and F + CHI -+ %F + CH3 (2) with E, -Ez = 0.5 f 0.2 kcal./mole.

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