VMMC VMMC Medical Solved Paper-2003

  • question_answer
    The entropy change of water, when 18 g water is converted at constant temperature into steam, is: (Given, \[\Delta {{H }_{\upsilon }}=40.7\text{kJ}\text{mo}{{\text{l}}^{-1}}\]):

    A)  \[109.11\,\text{J}{{\text{K}}^{-1}}\text{mo}{{\text{l}}^{-1}}\]

    B)  \[218.22\,\text{J}{{\text{K}}^{-1}}\text{mo}{{\text{l}}^{-1}}\]

    C)  \[54.56\,\text{J}{{\text{K}}^{-1}}\,\text{mo}{{\text{l}}^{-1}}\]

    D)  none of these

    Correct Answer: A

    Solution :

    We know that, \[\Delta S=\frac{\Delta {{H}_{\text{vap}}}}{T}\] \[=\frac{40.7\times {{10}^{3}}}{373}\]


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