A general competitive method is described for the study of the kinetics of the reactions of radicals with halogens and interhalogen compounds in the gas phase. The method is applied to the reactionsover the temperature range of 48"-199"C. I t is found that log ( k~/ k 5 ) = log (kJk7) = (-0.042 f 0.060) -(8700 f 1300)/6 where 6 = 2.303 RT Jlmol. Also,There is no correlation between differences in activation energies and differences in enthalpy changes for these reactions, but polar effects may be important in reactions (7) and (8).
The kinetics of the forward and reverse reactions in the gas-phase system Br, + i-C,F,H HBr + i-C,F,Br have been studied. The slow steps for the forward and reverse reactions, respectively, are
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