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VIT Engineering VIT Engineering Solved Paper-2011

  • question_answer
    For the reaction, \[{{C}_{3}}{{H}_{8}}(g)+5{{O}_{2}}(g)\xrightarrow{{}}3C{{O}_{2}}(g)+4{{H}_{2}}O)(l)\] at constant temperature, \[\Delta H-\Delta E\] is

    A)  \[RT\]           

    B)  \[-3RT\]

    C)  \[3RT\]          

    D)  \[-RT\]

    Correct Answer: B

    Solution :

     \[{{C}_{3}}{{H}_{8}}(g)+5{{O}_{2}}(g)\xrightarrow{{}}3C{{O}_{2}}(g)+4{{H}_{2}}O(l)\] \[\Delta {{n}_{g}}={{n}_{p}}-{{n}_{r}}\] \[=3-6=-3\] \[\Delta H=\Delta E+\Delta {{n}_{g}}RT\] \[\Delta H=\Delta E-3RT\] \[\Delta H-\Delta E=-3RT\]


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