Relation between Gaseous and Liquid Mixtures

Relation Between Gaseous and Liquid Mixtures.—As we have indicated, second virial coefficients can be calculated by corresponding-states methods with sufficient accuracy to be useful in predicting the properties of pure gaseous substances and their mixtures. This is of considerable practical importance for 

Hildebrand, J. M. Prausnitz, and R. L. Scott, Regular and Related Solutions , Van Nostrand Reinhold, New York, 1970, p. 99. 

Given the precision of the data, the correlation between the low- and high-density values of is quite good. For some mixtimes, however, the liquid-phase values are markedly smaller than those obtained from the gas. These are typically systems such as HgS + QH4 for which a specific acid-base interaction in the liquid phase might be expected. Generally speaking, however, gas-phase determinations of i provide valuable information for the prediction and correlation of the properties of liquid mixtures. 

---