Equivalent Potential Functions to Calculate Thermodynamic Equilibria* |
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Authors: | Email author" target="_blank">M?CapitelliEmail author S?Longo G?Petrella D?Giordano |
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Institution: | (1) Department of Chemistry, (Section of Bari), University of Bari & IMIP C.N.R., Bari, Italy;(2) Department of Chemistry, University of Bari, Bari, Italy;(3) Aerothermodynamics Section, ESTEC, Noordwijk, The Netherlands |
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Abstract: | The present paper contains an analysis of alternative functions to describe chemical equilibrium. In particular we show the
equivalence of equilibrium criteria based on pressure, volume and temperature, and corresponding constraints, with respect
to those popularly used in thermodynamics, i.e. those based on the minimization of internal energy, enthalpy, Helmholtz and
Gibbs potentials. The analysis emphasizes the role of mathematical virtual procedures in determining the equilibrium conditions
and the irrelevance of physico-chemical transformations that bring the system into the equilibrium state. Different examples,
including a new derivation of Saha’s equation, are dealt with to validate this conceptual approach.
This paper is dedicated to the memory of one of the authors, Giuseppe Petrella, who unfortunately is not with us any more. |
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