On entropies and temperature parameters characterizing product distributions in chemical reactions and corresponding thermodynamic quantities

The relations between the entropy (information content) and temperature parameters characterizing non-relaxed product distributions in chemical reactions and thermodynamic quantities are demonstrated. Two cases of initial reactant distributions–state-selected and thermal–are considered. The entropy change in the passage from non-equilibrium product distributions to partially relaxed distributions and the connection between the two kinds of vibrational temperatures characterizing these stages are treated in detail. An actual ‘entropy cycle’ is described.