NEET Sample Paper NEET Sample Test Paper-40

  • question_answer
    Standard enthalpy and standard entropy change for the oxidation of \[N{{H}_{3}}\] at 298 K are -3 82.64 kJ \[mo{{l}^{-1}}\]and \[-145.6\,J\,mo{{l}^{-1}}\] respectively. Standard free energy change for the same reaction at 298 K is

    A) \[-221.1\,kJ\,mo{{l}^{-1}}\]

    B) \[-339.3\text{ }kJ\text{ }mo{{l}^{-1}}\]

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

    D) \[-523.2\text{ }kJ\text{ }mo{{l}^{-1}}\]

    Correct Answer: B

    Solution :

     \[\Delta {{\Eta }^{o}}=-382.64\,kJ\,mo{{l}^{-1}}\] Give that, \[\Delta {{S}^{o}}=-145.6\,J\,{{K}^{-1}}\,mo{{l}^{-1}}\] \[=-145.6\times {{10}^{-3}}\,kJ\,{{K}^{-1}}\] or  \[\Delta {{G}^{o}}=-382.64-(298\times 1-145.6\times {{10}^{-3}})\] \[=-339.3\,kJ\,mo{{l}^{-1}}.\]


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