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The reduced form of the van der Waals equation is notable because

  • A.it requires the acentric factor as an input
  • B.it contains no substance-specific constants
  • C.it predicts liquid densities to within one per cent
  • D.it applies only along the critical isotherm itself

Answer: B

Writing pressure, volume and temperature as fractions of their critical values eliminates a and b entirely, which is the theoretical basis of two-parameter corresponding states. Its inaccuracy is the inaccuracy of that principle.

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