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CMC Medical CMC-Medical Ludhiana Solved Paper-2010

  • question_answer
    The latent heat of vaporization of water is 2240 J. If the work done in the process of vaporization of 1 g is 168 J, then increase in internal energy will be

    A)  1904 J                                  

    B)  2072 J

    C)  2240 J                                  

    D)  2408 J

    Correct Answer: B

    Solution :

                    From first law of thermodynamics, we have                                                                                                           \[\Delta U=Q-W\] which states that, if an amount of heat Q is given to a system, a part of it will be used in increasing the internal energy \[(\Delta U)\] of the system and the rest in doing work (W). \[\therefore \] We have, \[Q=ML=1\times 2240\,J\] and             \[W=168\,J\] \[\therefore \]  \[\Delta U=2240-168\]        \[=2072\,J\]


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