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Question

Which of the following values are incorrect for the cyclic process?

  1. dU=0
  2. q=W
  3. dH=0
  4. W=31.4 J


Solution

The correct option is D W=31.4 J
Since it is a cyclic process, and internal energy is a state function, hence dU=0, for the same reason, `dH=0`.

Also from the first law of thermodynamics,
q=ΔU+(W)q=W

Also, W = area covered by sphere = πr2
=π[(V2V1)2]2=π×(20)222=100π=100×3.14=314 J

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