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Discussion

The fundamental property relation for internal energy expresses it in terms of

  • A.entropy and volume as the independent variables
  • B.temperature and pressure as the independent variables
  • C.enthalpy and entropy as the independent variables
  • D.pressure and volume as the independent variables

Answer: A

Writing the change in internal energy as temperature times the entropy change minus pressure times the volume change makes entropy and volume its natural variables. Each of the four energies has its own pair, and using the wrong pair loses information.

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