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All of the following are assumptions behind the Clausius-Clapeyron equation EXCEPT

  • A.the vapour behaves as an ideal gas
  • B.the liquid volume is negligible beside the vapour volume
  • C.the latent heat is constant over the range considered
  • D.the pressure remains constant along the boundary

Answer: D

Pressure varies along a vapour pressure curve by definition, so constancy would be self-contradictory. The other three are the standard simplifications that produce the logarithmic form. Each may be relaxed at the cost of a more awkward integral.

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