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BCECE Engineering BCECE Engineering Solved Paper-2012

  • question_answer
    \[{{\text{U}}^{\text{o}}}\]of combustion of methane is\[-X\,k\,J\,mo{{l}^{-1}}.\] The value of \[\Delta {{ H }^{o}}\] is

    A)  \[=\Delta {{U}^{o}}\]    

    B) \[>\Delta {{U}^{o}}\]                    

    C) \[<\Delta {{U}^{o}}\]    

    D) \[=0\]

    Correct Answer: C

    Solution :

    \[C{{H}_{4}}(g)+2{{O}_{2}}(g)\xrightarrow{{}}C{{O}_{2}}(g)+2{{H}_{2}}O(l)\] \[\Delta {{n}_{g}}=({{n}_{p}}-{{n}_{r}})=1-3=-2\] \[\Delta {{H }^{o}}=\Delta {{U}^{o}}+\Delta {{n}_{g}}RT\] \[\Delta {{H}^{o}}=-X-2RT\] or \[\Delta {{H }^{o}}<\Delta {{U}^{o}}\]


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