J & K CET Engineering J and K - CET Engineering Solved Paper-2003

  • question_answer
    The enthalpy change for the transition of liquid water to steam is \[40.8\,kJ\,mo{{l}^{-1}}\]at \[373\,K.\] Calculate the entropy of vaporisation of water.

    A)  \[109.4\,J{{K}^{-1}}\,mo{{l}^{-1}}\]

    B)  \[-109.4\,J{{K}^{-1}}\,mo{{l}^{-1}}\]

    C)  \[218.8\,J{{K}^{-1}}\,mo{{l}^{-1}}\]

    D)  \[-218.8\,J{{K}^{-1}}\,mo{{l}^{-1}}\]

    Correct Answer: A

    Solution :

     \[{{\Delta }_{vap}}S=\frac{{{\Delta }_{vap}}H}{T}=\frac{40.8\times {{10}^{3}}}{373}\] \[{{\Delta }_{vap}}S=109.4\,J{{K}^{-1}}mo{{l}^{-1}}\]


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