Gibbs energies solution, Group

Table 2.3 contains the standard Gibbs energies of formation and the standard enthalpies of formation of a selection of main group cations at 25 °C. They refer to the formation of 1 mol dm- solutions of the cations from their elements and are relative to the values for the hydrated proton taken as zero. 

The results are given in Table 3.12 for the Gibbs energies of solution of the solid Group 1 halides, and are plotted against the cation radii in Figure 3.7. 

Table 3.12 Gibbs energies o solution o( the Group 1 halides (kj mor )...

Figure 3.7 Plots of the Gibbs energies of solution against cation radius for the Group 1 halides...

Mavrovouniotis, M.L. 1990. Group contributions for estimating standard Gibbs energies of formation of biochemical compounds in aqueous solution. Biotechnol. Bioeng. 36, 1070-1082. 

After the seminal work of Guggenheim on the quasichemical approximation of the lattice statistical-mechanical theory[l], various practical thermodynamic models such as excess Gibbs energies[2-3] and equations of state[4-5] were proposed. However, the quasichemical approximation of the Guggenheim combinatory yields exact solution only for pure fluid systems. Therefore one has to resort to numerical procedures to find the solution that is analytically applicable to real mixtures. Thus, in this study we present a new unified group contribution equation of state[GC-EOS] which is applicable for both pure or mixed state fluids with emphasis on the high pressure systems[6,7]. 

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