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Chhattisgarh PMT Chhattisgarh PMT Solved Paper-2007

  • question_answer
    For the reaction,\[{{C}_{2}}{{H}_{5}}OH(l)+3{{O}_{2}}(g)\xrightarrow{{}}2C{{O}_{2}}(g)+3{{H}_{2}}O(l)\] Which one is true?

    A)  \[\Delta H=\Delta E-RT\]   

    B)  \[\Delta H=\Delta E+RT\]

    C)  \[\Delta H=\Delta E+2RT~\]

    D)  \[\Delta H=\Delta E-2RT~\]

    Correct Answer: A

    Solution :

    \[{{C}_{2}}{{H}_{5}}OH(l)+3{{O}_{2}}(g)\xrightarrow{{}}2C{{O}_{2}}(g)+3{{H}_{2}}O(l)\] \[\Delta {{n}_{g}}=2-3\] \[\therefore \]                  \[\Delta {{n}_{g}}=-1\] On applying,                 \[\Delta H=\Delta E+\Delta {{n}_{g}}RT\] \[\therefore \]  \[\Delta H=\Delta E-RT\]


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