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The very-low-pressure study of the kinetics and equilibrium: Cl + CH4 ⇄ CH3 + HCl at 298 K. The heat of formation of the CH3 radical

✍ Scribed by Mohammad H. Baghal-Vayjooee; Agustin J. Colussi; Sidney W. Benson

Publisher
John Wiley and Sons
Year
1979
Tongue
English
Weight
345 KB
Volume
11
Category
Article
ISSN
0538-8066

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✦ Synopsis

The bimolecular rate constant for the direct reaction of chlorine atoms with methane was measured a t 25°C by using the very-low-pressure-pyrolysis technique. The rate constant was found to be klZs8 = (0.93 f 0.05) X cm3/molec. sec

In addition, the ratio k&-l was observed with about 25% accuracy: K 1 ( ~8 ) = 1.3 f 0.3. This gives a heat of formation of the methyl radical AH"f mS(CH3) = 35.1 f 0.15 kcal/mol. A bond dissociation energy BDE (CH3 -H) --105.1 f 0.15 kcal/mol in good agreement with literature values was obtained.

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