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Discussion

The Poynting correction accounts for

  • A.the pressure effect on a condensed phase fugacity
  • B.the non-ideality of the vapour phase
  • C.the temperature dependence of the vapour pressure
  • D.the departure of a solution from ideality

Answer: A

Correct answer: the pressure effect on a condensed phase fugacity

\[ \exp\left[\int_{P^{sat}}^{P}\frac{V^{L}}{RT}\,\mathrm{d}P\right] \] corrects the fugacity of a liquid from its saturation pressure up to the system pressure. Because the liquid molar volume is small, the factor is very close to unity at moderate pressures and is often neglected - and it becomes significant only at high pressure or well below the normal boiling point.

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