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The Clausius-Clapeyron equation is obtained from the Clapeyron equation by assuming that

  • A.the two phases have exactly equal molar volumes
  • B.the pressure stays constant along the whole boundary
  • C.the vapour is ideal and the liquid volume small
  • D.the latent heat varies strongly with the temperature

Answer: C

Those two approximations replace the volume change with the ideal gas volume and give the familiar logarithmic form. They are good well below the critical point and poor as it is approached. Near the critical point the liquid volume is no longer small.

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