Premium
The very‐low‐pressure study of the kinetics and equilibrium: Cl + CH 4 ⇄ CH 3 + HCl at 298 K. The heat of formation of the CH 3 radical
Author(s) -
BaghalVayjooee Mohammad H.,
Colussi Agustin J.,
Benson Sidney W.
Publication year - 1979
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550110206
Subject(s) - chemistry , bond dissociation energy , reaction rate constant , standard enthalpy of formation , kinetics , chlorine , dissociation (chemistry) , pyrolysis , methane , activation energy , standard enthalpy change of formation , equilibrium constant , kinetic energy , thermodynamics , analytical chemistry (journal) , organic chemistry , physics , quantum mechanics
The bimolecular rate constant for the direct reaction of chlorine atoms with methane was measured at 25°C by using the very‐low‐pressure‐pyrolysis technique. The rate constant was found to be\documentclass{article}\pagestyle{empty}\begin{document}$$ k_1^{298} = (0.93 \pm 0.05) \times 10^{ - 13} cm^3 /mole \cdot \sec $$\end{document}In addition, the ratio k 1 / k −1 was observed with about 25% accuracy: K 1(298) = 1.3 ± 0.3. This gives a heat of formation of the methyl radical Δ H ° f 298 (CH 3 ) = 35.1 ± 0.15 kcal/mol. A bond dissociation energy BDE (CH 3 H) = 105.1 ± 0.15 kcal/mol in good agreement with literature values was obtained.