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DUMET Medical DUMET Medical Solved Paper-2004

  • question_answer
    \[\underset{{{S}^{o}}(298K)\,J{{K}^{-1}}-10.7}{\mathop{{{H}^{+}}(aq)+O{{H}^{-}}(aq)}}\,\xrightarrow{{}}\underset{+70}{\mathop{{{H}_{2}}O\,\,(l)}}\,\] Standard entropy change for the above reaction is:

    A)  \[60.3\,\,J{{K}^{-1}}mo{{l}^{-1}}\]

    B)  \[80.7\,\,J{{K}^{-1}}mo{{l}^{-1}}\]

    C)  \[-70.7\,\,J{{K}^{-1}}mo{{l}^{-1}}\]

    D)  \[+10.7\,\,J{{K}^{-1}}mo{{l}^{-1}}\]

    Correct Answer: B

    Solution :

    Key Idea: \[\Delta S={{S}_{p}}-{{S}_{R}}\]   Given, \[{{S}_{p}}=70\,J{{K}^{-1}}mo{{l}^{-1}}\] \[{{S}_{R}}=-10.7\,J{{K}^{-1}}mo{{l}^{-1}}\] \[\therefore \] \[\Delta S=70-(-10.7)\] \[=70+10.7\] \[=80.78\,J{{K}^{-1}}mo{{l}^{-1}}\]


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