A system absorbs 187 kJ of heat and the surroundings do 120 kJ of work on the system. What is the change in internal energy of the system?

NetherCraft 0

in kilojoules kJ

1 Answer

  • When the system does work on its surroundings, energy is lost, and delta E is negative.

    When the surroundings do work on the system, the internal energy of the system becomes larger, so delta E is positive.

    Delta E = q + w

    System absorbs heat : q = +187

    Work done on the system, the number is positive. w = +120

    Delta E = 187 kJ + 120 kJ = 307 kJ

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