Rate constant for the reaction CH3CO.+ HBr and the enthalpy of formation of the CH3CO.radical

Gergely Kovács, Ákos Bencsura, Sándor Dóbé, Tibor Bérces, Ferenc Márta

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Pulsed laser photolysis coupled with time-resolved UV-absorption monitoring of CH3CO.radicals was applied to obtain the rate constant, k 1, for the reaction CH3CO.+ HBr → CH3C(O)H + Br (1); k 1(298 K) = (3.59 ± 0.23 (2σ))x10-12cm3molecule-1s-1. Utilization of k 1in a third law procedure has provided the standard enthalpy of formation value ofDf298(CH 3CO) = -10.04 ± 1.10 (2σ) kJ mol -1in excellent agreement with a very recent IUPAC recommendation.

Original languageEnglish
Pages (from-to)355-361
Number of pages7
JournalReaction Kinetics and Catalysis Letters
Issue number2
Publication statusPublished - Nov 1 2005



  • Bromination kinetics
  • CHCO;
  • Thermochemistry

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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