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The Joule-Thomson coefficient can be expressed through property relations in terms of

  • A.the latent heat and the vapour pressure curve
  • B.volume, expansivity and heat capacity
  • C.the entropy and the gas constant only
  • D.the acentric factor and the critical pressure

Answer: B

A Maxwell relation converts the enthalpy derivative into measurable quantities, giving a coefficient whose sign is decided by whether the expansivity times temperature exceeds one. That is why an ideal gas has a coefficient of exactly zero.

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