Excess Gibbs energy models used to calculate this quantity include UNIQUAC and the relatively simple empirical Margules equation.
The Gibbs-Duhem equation can be written in terms of partial derivatives of the natural log of this quantity. Excess Gibbs energy models used to calculate this quantity include UNIQUAC and the relatively simple empirical Margules equation. Another equation used to find this quantity uses a virial expansion, and is often used when a similar equation's limiting law has been surpassed. When the liquid mole (*) fraction of a species in a mixture approaches zero this quantity takes on a unique value in the Henry's law regime. The Pitzer equation can be used to find this quantity, which is one for an ideal solution as it measures the nonideality of real solutions. For 10 points, name this dimensionless coefficient symbolized gamma similar to concentration that can sometimes be found for electrolytic solutions via the Debye-HÃ¼ckel equation.
The Gibbs-Duhem equation can be written in terms of partial derivatives of the natural log of this quantity.
activity coefficients 