A study of the Br+IO->I+BrO and the reverse reaction

The rate coefficient, k(1) (298 K)=(5.0+/-1.1)x10(-11) cm(3) molecule(-1) s(-1), for the reaction, Br+10-->I+BrO (1) was determined by monitoring the temporal profiles of IO in an excess of Br. The rate coefficient for the reverse reaction, I+BrO-->IO+Br(-1), k(-1) (298 K)=(1.9+/-1.1)x10(-11) cm(3) molecule(-1) s(-1), was determined by modeling IO temporal profiles, measured in the presence of BrO and O-3, in which the regeneration of IO was observed. From these rate coefficients, the difference in the heats of formations of IO and BrO, Delta(f)H(0) (298 K) (BrO)-Delta(f)H(0) (298 K) (IO), was calculated to be 0.5+/-0.6 kcal mol(-1). (C) 1997 Elsevier Science B.V.