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For a strongly polar or hydrogen bonding mixture such as water and ethanol, a plain cubic equation of state

  • A.performs poorly, so an activity model is preferred
  • B.performs a good deal better than for hydrocarbon mixtures
  • C.reduces exactly to the ideal gas law at all conditions
  • D.requires no binary interaction parameter of any kind

Answer: A

The attraction term averages over molecular interactions that are strongly directional in such systems, so the physical picture behind it breaks down. Gamma-phi methods using an activity coefficient model handle the liquid phase instead.

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