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The oxidation of HI at low temperatures and the heat of formation of HO2

✍ Scribed by Lilian G. S. Shum; Sidney W. Benson

Publisher
John Wiley and Sons
Year
1983
Tongue
English
Weight
699 KB
Volume
15
Category
Article
ISSN
0538-8066

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✦ Synopsis

The kinetics of the oxidation of hydrogen iodide (HI + 0 2 ) a t low temperature (414-499 K) in the gas phase by the method of idination kinetics is complicated by a heterogeneous reaction between hydrogen iodide and oxygen. Present work leads to an upper limit for the bimolecular rate constant kl for the first and rate-determining step (1) HI + 0 2 + HOz + I These data are combined with an estimated A factor A1 = 109.3*0.2 L/mol.s (assuming a tight linear I-H--Otransition state), to calculate the lower limit of the activation energy for the forward reaction E l . This leads to a minimum value for the heat of formation of the HO:! radical, AH;29B(H02) > 3.0 kcal/mol. 'Throughout this paper the standard state for thermochemical data is 298 K and 1 atm, unless otherwise noted. All thermochemical data from IS].

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