Abstract
Quasi-thermodynamic magnitudes obtained from three different analytical fits to the experimental rate constants of the CH 4+OH reaction are compared to the values obtained from theoretical rate constants calculated using canonical variational transition state theory plus multidimensional tunnelling contributions. A right decomposition of ΔG tot,0 into its enthalpic and entropic contributions is not experimentally feasible because it depends on the particular analytical expression used for the rate constants. Then, theoretical calculation of the rate constants at all the required temperatures becomes the only way to get reliable values of ΔH tot,0 (and E a) and ΔS tot,0. Our results show that both variational and tunnelling nonsubstantial contributions to the quasi-thermodynamic magnitudes are significant for the CH 4+OH reaction and, probably, for a wide range of gas-phase chemical reactions.
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