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BVP Medical BVP Medical Solved Paper-2009

  • question_answer
    For   a   gaseous   reaction   at   300 K, \[\Delta H-\Delta E=-\text{ }4.98\text{ }kJ\],     assuming     that \[R=8.3J\,{{K}^{-1}}\,mo{{l}^{-1}},\,\Delta {{n}_{(g)}}\] is

    A)  \[1\]                                    

    B)  \[2\]

    C)  \[-2\]                                   

    D)  \[0\]

    Correct Answer: C

    Solution :

                    We know that, \[\Delta H=\Delta E+\Delta {{n}_{g}}RT\] \[\Delta H-\Delta E+\Delta {{n}_{g}}RT\]                 \[\Rightarrow \]               \[-4.98=\Delta {{n}_{g}}\times 8.3\times {{10}^{-3}}\times 300\]                                 \[\Delta {{n}_{g}}=\frac{-4.98}{8.3\times {{10}^{-3}}\times 300}\]                 \[\therefore \]  \[\Delta {{n}_{g}}=-2\]


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