Resumen

INIGUEZ, Jose. The Constant Entropy Path for a Chemical Reaction. Educ. quím [online]. 2010, vol.21, n.2, pp.163-169. ISSN 0187-893X.

The internal energy minimum as a criterion for equilibrium is here discussed in reference to a chemical reaction. That a non-isolated system at constant entropy and volume heads for a state of minimum internal energy is here shown via a thermodynamic analysis of the para-ortho isomerization reaction of hydrogen. The analysis brings forward the equations for the heat flow rate and temperature decreasing regime the reaction system has to comply with if a constant entropy path is to be accessed.

Palabras llave : hydrogen; ortho-para isomerization; thermodynamics; constant entropy; minimum internal energy principle.

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