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Select the correct statement (s).

  • A.When energy is transferred to the system from the surrounding as work, the surrounding do work on the system and the value of work (w) positive.
  • B.When energy is transferred from the system to the surrounding as work, work is done on the surrounding and the value of w is negative.
  • C.Both (a) and (b)
  • D.None of the above

Answer: C

Both statements are correct.

The sign convention of thermodynamics is written from the system's point of view: work done on the system is positive, and work done by the system on the surroundings is negative. With this convention the first law reads \[\Delta U = q + w\]

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