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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2012

  • question_answer
    Enthalpy of vaporization of benzene is\[+35.3kJ\] \[mo{{l}^{-1}}\]at its boiling point,\[80{}^\circ C\]. 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, \[{{\Delta }_{cond}}S=\frac{\Delta {{H}_{cond}}}{{{T}_{b}}}=\frac{-35.5\times {{10}^{3}}J\,mo{{l}^{-1}}}{(80+273)K}\]                 \[=-100J{{K}^{-1}}mo{{l}^{-1}}\]


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