ISSN:
0538-8066
Keywords:
Chemistry
;
Physical Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The reactions of Cl and Br atoms with H2O2 have been studied in the range of 300-350 K using the very-low-pressure-reactor technique. It was found that metathesis to produce HX and HO2 is the only significant process (≤99%). For the reaction of Br \documentclass{article}\pagestyle{empty}\begin{document}$${\rm Br}+{\rm H}_2{\rm O}_2\buildrel{2}\over{\rightarrow}{\rm Hbr} + {\rm HO}_2$$\end{document} k2 (300 K) = 1.3 ± 0.45 × 10-14 and k2 (350 K) = 3.75 ± 1.1 × 10-14 cm3/molecules·s, with an activation energy of 4.6 ± 0.7 kcal/mol. Using an estimated A factor for A2, we find \documentclass{article}\pagestyle{empty}\begin{document}$$\begin{array}{l} k_2 ({\rm benttransitionstate}) = 1.6 \times 10^{ - 11 - 4.3/\theta } \\ k_2 ({\rm lineartransitionstate}) = 4 \times 10^{ - 12 - 3.5/\theta } \\ \end{array}$$\end{document} suggesting that a best choice is E2 = 3.9 ± 0.4 kcal/mol. The relation of these values to ΔHf0 (HO2) is discussed.
Additional Material:
5 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/kin.550151206
