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The temperature dependence of the rate constant for the reaction F+HBr→HF+Br

✍ Scribed by Rachel Edrei; Avigdor Persky

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
551 KB
Volume
157
Category
Article
ISSN
0009-2614

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✦ Synopsis

The ratio of rate constants kF+HBr/kF+H2 has been determined by a discharge-flow-mass spcctrometric technique and was found to be independent of temperature in the range 203 to 298 K. Based on reported results fork,,,, it is concluded that k,,,,, exhibits an Arrhenius temperature dependence in this temperature range. The present results indicate that the mechanism for the F+HBr reaction is probably a direct hydrogen atom abstraction, rather than one involving the formation of a FBrH complex, as suggested by Wiirzberg and Houston, who found a marked non-Arrhenius behavior for this reaction. The present results for F+HBr are consistent with our earlier results for the Cl+HBr reaction.

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