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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2010

  • question_answer
    Enthalpy of vaporization of benzene is \[+\,\,35.3\,kJ\,\,mo{{l}^{-1}}\] 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,                 \[{{\Delta }_{cond}}S=\frac{{{\Delta }_{cond}}}{{{T}_{b}}}\]                 \[=\frac{-35.3\times {{10}^{-3}}J\,mo{{l}^{-1}}}{(80+273)K}\]      \[=-100\,J{{K}^{-1}}mo{{l}^{-1}}\]


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