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JCECE Engineering JCECE Engineering Solved Paper-2011

  • question_answer
    The latent heat of vaporisation of water is\[2240\,\,J\]. If the work done in the process of vaporisation of \[1\,\,g\] is\[168\,\,J\], then increases in internal energy is

    A) \[2408\,\,J\]                      

    B) \[2240\,\,J\]

    C)  \[2072\,\,J\]                     

    D)  \[1904\,\,J\]

    Correct Answer: C

    Solution :

    \[L=2240\,\,J,\,\,m=1\,\,g\]                 \[dW=168\,\,J\]                 \[dQ=mL=dU+dW\]                 \[1\times 2240=dU+168\]                 \[dU=2240-168\]                 \[=2072\,\,J\]


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