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Modified Raoult's law differs from Raoult's law by including

  • A.the Poynting correction for pressure
  • B.the molar volume of the liquid mixture
  • C.an activity coefficient for the liquid phase
  • D.a fugacity coefficient for the vapour phase

Answer: C

It is the simplest useful correction for a non-ideal liquid at low pressure, where the vapour may still be treated as ideal. Adding a vapour fugacity coefficient gives the full gamma-phi formulation. Below a few bar the vapour correction is negligible.

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