Elemental composition method in thermodynamics of multireaction systems - (I) - Molar number, thermodynamic properties and partial properties relations

When species in the solution undergo multiple chemical reactions, the solut ion may be treated as a solution of all species actually present or as a hy pothetical solution composed of elemental species. Based on the fundamental thermodynamic principle, the relationships of mole numbers, molar fraction s, thermodynamic properties, partial molar properties, potential and fugaci ty between the hypothetical solution of elemental species and the equilibra ted solution of actual species were derived. The hypothetical elemental sol ution provides a way of reducing the dimensionality of problem, simplifying the analysis and visualizing the phase behavior.