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JCECE Engineering JCECE Engineering Solved Paper-2014

  • question_answer
    Standard enthalpy and standard entropy change for the oxidation of \[N{{H}_{3}}\] at \[298\,\,K\] are \[-382.64\,\,kJ\,\,mo{{l}^{-1}}\]and\[-145.6\,\,J\,\,mo{{l}^{-1}}\]respectively. Standard Gibbs energy change for the same reaction at \[298\,\,K\] is

    A) \[+339.3\,\,kJ\,\,mo{{l}^{-1}}\] 

    B) \[-439.3\,\,kJ\,\,mo{{l}^{-1}}\]

    C)  \[-339.3\,\,kJ\,\,mo{{l}^{-1}}\] 

    D)  \[-393.3\,\,kJ\,\,mo{{l}^{-1}}\]

    Correct Answer: D

    Solution :

    \[\Delta {{G}^{o}}=\Delta {{H}^{o}}-T\Delta {{S}^{o}}\]                 \[=-382.64-298\times (-145.6\times {{10}^{-3}})\]                 \[=-339.3\,\,kJ\,\,mo{{l}^{-1}}\]


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