the energy fractions as vibration, rotation and translation for both products, E vib H2O, E rot H2O, E vib CH3S, E rot CH3S and Etrans. The QCT-DZPE/PES-2024 energy fractions are, respectively (in percentages): f vib H2O = 49, f rot H2O = 19, f vib CH3S = 4, f rot CH3S = 5 and ftrans = 23. The largest fraction of available energy is deposited as vibrational energy of the water product, 49%, reproducing the experimental evidence, 8 52%. This small difference could be explained by the known trend of the QCT calculations to overestimate the product rotational energy to the detriment of the vibrational energy. In addition, this is the expected behaviour in a very exothermic reaction with a heavy-light-heavy mass combination. The small fraction of energy deposited as vibration/rotation in the CH3S co-product, 9%, suggests that it will appear practically in its vibrational/rotational ground-state. In addition, the average available energy at 298 K has also been experimentally reported, 8 <Eav> = 34.9 ±0.4 kcal mol -1 . The present QCT-DZPE/PES-2024 results give 33.0 kcal mol -1 , reproducing the experimental evidence, taking into account that the latter was obtained using a value of 32.5±2.0 kcal mol -1 for the CH3S enthalpy of formation, which presents an error of ±2 kcal mol -1 .