Example 8.6. Estimation of Second Virial Coefficients Polar Compounds

6 Example 8.6. Estimation of Second Virial Coefficients Polar Compounds 

For polar and especially hydrogen bonded compounds, we cannot expect the three-parameter corresponding states correlation for B to give successful results. Indeed, Tsonopoulos adds to Eq.(A) of Example 8.5 one more term  

(A) provides excellent representation of existing second virial coefficient data but its prediction capabilities are limited. For non-hydrogen bonded compounds b assumes the value of zero, and an approximate expression for a is given in the 1974 article for ketones and ethers. Values of a and b for some hydrogen bonded compoimds are also given. 

The virial equation is applicable to the vapor and gaseous phases only (why ). 

1n the typical application, one needs to calculate the volume from the known values of the pressure and temperature, and Eq.8.9.2 is more convenient for this purpose. 

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