THE EXCESS MOLAR GIBBS ENERGY OF NUCLIDIC LIQUID-MIXTURES

The calculation of G(m)(E) from VLE measurements has been extended to multicomponent systems including those where chemical reactions can oc cur. For nuclide mixtures, the methods have to be adapted in order to take into account the similarity of the mixture's components and the p seudo-multicomponent characteristics of a system with isotopic exchang e. Bigeleisen's theory of isotope effects can then be used to calculat e self-exchange equilibrium constants in the liquid phase at low tempe ratures and the vapour pressure of partially substituted nuclides. The formalism is applied to some relevant cases, namely those of water an d ammonia.