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Manipal Engineering Manipal Engineering Solved Paper-2011

  • question_answer
    \[(\Delta H-\Delta U)\]for the formation of carbon monoxide\[(CO)\]from its elements at\[298\,\,K\]is\[(R=8.314\,\,J{{K}^{-1}}mo{{l}^{-1}})\]

    A) \[-1238.78\,\,J\,\,mo{{l}^{-1}}\]

    B)                        \[1238.78\,\,J\,\,mo{{l}^{-1}}\]

    C)                        \[-2477.57\,\,J\,\,mo{{l}^{-1}}\]

    D)                        \[2477.57\,\,J\,\,mo{{l}^{-1}}\]

    Correct Answer: A

    Solution :

    \[{{C}_{(s)}}+\frac{1}{2}{{O}_{{{2}_{(g)}}}}\xrightarrow{{}}C{{O}_{(s)}}+(\Delta H-\Delta U)=-\Delta nRT\]       \[=-\frac{1}{2}\times 8.314\times 298=1238.78\]


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