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The first law for a closed system undergoing a process states that

  • A.the change in internal energy equals heat added minus work done
  • B.the change in enthalpy equals the heat added at any condition
  • C.the change in entropy equals the heat added divided by temperature
  • D.the work done equals the heat added for every process

Answer: A

Energy entering as heat either raises the internal energy or leaves as work, which is the content of the law for a fixed mass. The enthalpy statement holds only at constant pressure and the entropy statement belongs to the second law.

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