The virial equation is considered more general than the van der Waals equation because

Ait has fewer adjustable constants
Bits coefficients can be fitted to experimental data or derived from intermolecular potentials to any required accuracy
Cit does not depend on temperature
Dit predicts a universal critical compressibility factor

Answer: B

The virial series is an exact expansion of

Z

whose coefficients can be determined empirically or from statistical mechanics; adding more terms improves accuracy. The van der Waals equation is a fixed two-parameter approximation that is only a special case of the series.

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