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Punjab Medical Punjab - MET Solved Paper-2011

  • question_answer
    \[\underset{\begin{smallmatrix}  -10.7 \\  {{S}^{o}}(298\,\,K)  \\  JK\,\,mo{{l}^{-1}} \end{smallmatrix}}{\mathop{{{H}^{+}}(aq)}}\,+O{{H}^{-}}(aq)\xrightarrow{{}}\underset{+70}{\mathop{{{H}_{2}}O}}\,(l)\]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) \[-70\,\,J{{K}^{-1}}mo{{l}^{-1}}\]

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

    Correct Answer: B

    Solution :

                    \[\Delta S={{S}_{p}}-{{S}_{R}}\]                 \[{{S}_{p}}=70\,\,J{{K}^{-1}}mo{{l}^{-1}}\]                 \[{{S}_{R}}=10.7\,\,JK\,\,mo{{l}^{-1}}\] \[\therefore \]  \[\Delta S=70-(-10.7)=70+10.7\]                 \[=80.7\,\,J{{K}^{-1}}\,\,mo{{l}^{-1}}\]


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