RATE CONSTANT FOR THE REACTION CH3CO + HBR AND THE ENTHALPY OF FORMATION OF THE CH3CO RADICAL


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Abstract

Pulsed laser photolysis coupled with time-resolved UV-absorption monitoring of CH3CO radicals was applied to obtain the rate constant, k1, for the reaction CH3CO + HBr → CH3C(O)H + Br (1); k1(298 K) = (3.59 ± 0.23 (2σ))x10−12cm3 molecule−1s−1. Utilization of k1 in a third law procedure has provided the standard enthalpy of formation value of DfH298(CH3CO) = −10.04 ± 1.10 (2σ) kJ mol−1 in excellent agreement with a very recent IUPAC recommendation.

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