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The enthalpy of a real gas depends on

  • A.neither
  • B.both temperature and pressure
  • C.temperature alone in all cases
  • D.pressure alone in all cases

Answer: B

Only for an ideal gas does the pressure dependence vanish, and the residual enthalpy measures exactly that departure. The Joule-Thomson effect exists because the pressure dependence is not zero. Residual enthalpy is the quantity that measures it.

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