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JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank Mock Test - Chemical Thermodynamics

  • question_answer
    If the internal energy of a system decreases by 128 J and at the same time it absorbs 56 J of heat, then

    A) work is done by the system equal to +71 J

    B)  work is done by the system equal to -184 J

    C)  work is done by the system equal to -71 J

    D)  work is done by the system equal to 179 J

    Correct Answer: B

    Solution :

    [b] \[\Delta E=q+W\] Internal energy decreases by 128 J thus, \[\Delta E=-128J\] Heat is absorbed, \[q=+56J\] Thus, \[W=\Delta E-q=(-128-56)J=-184J\]


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