An ideal monatomic gas when heated absorbs 100 J of heat and does work equivalent to 25 J on the surroundings. The change in internal energy of the gas is

An ideal monatomic gas when heated absorbs 100 J of heat and does work equivalent to 25 J on the surroundings. The change in internal energy of the gas is

  1. A

    62.5 J

  2. B

    75 J

  3. C

    125 J

  4. D

    150 J

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    Solution:

    The change in internal energy of the gas is

    ΔU=q+w =100J25J =75J

    Thus the option B is correct.

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