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The temperature that appears in the entropy transfer term of a balance is

  • A.the temperature of the surroundings in every case
  • B.the initial temperature at the start of the process
  • C.the temperature of the boundary the heat crosses
  • D.the average temperature of the system as a whole

Answer: C

Entropy accompanies heat at the temperature of the surface it crosses, so a large difference between system and surroundings shows up as generation. Choosing the boundary carefully decides where that generation is booked.

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