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NEET NEET SOLVED PAPER 2017

  • question_answer
    A gas is allowed to expand in a well-insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy \[\Delta U\] of the gas in joules will be                                                                                                                                                               

    A)  +505 J  

    B) 1136.25 J

    C) -500 J  

    D) -505 J

    Correct Answer: D

    Solution :

    \[\Delta U=q+w\] For adiabatic process, q = 0 \[\therefore \]  \[\Delta U=w\] \[=-P.\Delta V\] \[=-2.5\times 2\,L-atm\] \[=-5\times 101.3\,J\] \[=-506.5\,J\] \[=-505\,J\]


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