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Peng-Robinson is generally preferred to Soave-Redlich-Kwong when the calculation needs

  • A.the simplest possible algebraic form that is available
  • B.results for ideal gases at very low pressure
  • C.an equation carrying no adjustable parameters
  • D.reliable liquid densities as well as vapour behaviour

Answer: D

Its modified volume dependence was chosen specifically to improve the liquid root, where Soave is noticeably poor. For vapour pressures alone the two perform very much alike. Simulators usually offer both and let the user choose.

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