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The paper gives an account of a detailed investigation of the thermodynamicbranch as a path of the chemical system deviation from its isolatedthermodynamic equilibrium under an external impact. For a combination of directand reverse reactions in the same chemical system, full thermodynamic branch ispresented by an S-shaped curve, whose ends asymptotically achieve appropriateinitial states, which, in turn, are logistic ends of the opposite reactions.The slope tangents of the steepest parts of the curves, the areas of themaximum rate of the shift growth vs. the external thermodynamic force, occurredto be directly proportional to the force and, simultaneously, linearlyproportional to the thermodynamic equivalent of chemical reaction, which is theratio between the amount in moles of any reaction participant, transformed inan isolated system, along the reaction way from its initial state tothermodynamic equilibrium, to its stoichiometric coefficient. The foundlinearity is valid for arbitrary combination of the stoichiometric coefficientsin a reaction of compound synthesis from chemical elements like aA+bB=AaBb, andconfirms the exclusive role of the thermodynamic equivalent of transformationas the chemical system characteristic of robustness and irreversibility.Results of this work allow for quantitative evaluation of the chemical systemshift from thermodynamic equilibrium along thermodynamic branch and its ratevs. the shifting force. Such an investigation became possible due to thedevelopment of discrete thermodynamics of chemical equilibria.

Thermodynamic Branch in the Chemical System Response to External Impact