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CET Karnataka Medical CET - Karnataka Medical Solved Paper-2010

  • question_answer
    Enthalpy of vaporization of benzene is \[+35.3kJ\,mo{{l}^{-1}}\]at its boiling point,\[{{80}^{o}}C\]. The entropy change  in the transition of the vapour to liquid at its boiling point in \[[J{{K}^{-1}}\,mo{{l}^{-1}}]\] is

    A)  \[-441~\]       

    B)  \[-100\]

    C)  \[+441\]

    D)  \[+100\]

    Correct Answer: B

    Solution :

    Entropy change in the transition of the vapour to liquid, \[{{\Delta }_{cond}}S=\frac{\Delta {{H}_{cond}}}{{{T}_{b}}}\] \[=\frac{-35.3\times {{10}^{3}}J\,mo{{l}^{-1}}}{(80+273)K}\] \[=-100J{{K}^{-1}}\,mo{{l}^{-}}\]


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