An expression for one of these quantities is obtained by differentiating the virial expansion of excess Gibbs free energy with respect to molality in the Pitzer equations. For 10 points each:
[10m] Name these dimensionless quantities that may be calculated from a sum of combinatorial and residual contributions in the UNIQUAC model.
ANSWER: activity coefficients
[10e] The Guggenheim-Staverman correction to the combinatorial contribution shifts it to more closely model solutions described by this adjective. Other substances described by this adjective can be modeled by a combination of Charles’ law, Boyle’s law, and Avogadro’s law.
ANSWER: ideal solution [accept word forms; accept ideal gas or ideal gasses]
[10h] When describing vapor-liquid phase equilibria, UNIQUAC is outclassed by a model that appends the acronym SPACE to the name of this model. As its name implies, this model treats solvents as ideal conductors.
ANSWER: COSMO [or COnductor-like Screening MOdel; accept COSMOSPACE]
<Omer, Chemistry>