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JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank Heat of reaction

  • question_answer
    The heat of combustion of carbon is ?94 kcal at 1 atm pressure. The intrinsic energy of \[C{{O}_{2}}\] is

    A)                 \[+94\,kcal\]     

    B)                 \[-\,94\,kcal\]

    C)                 \[+47\,kcal\]     

    D)                 \[-47\,kcal\]

    Correct Answer: B

    Solution :

           \[{{C}_{(S)}}+{{O}_{2}}_{(g)}\to C{{O}_{2}}_{(g)}\], \[\Delta {{n}_{g}}=1-1=0\]            \[\therefore \Delta E=\Delta H=-94\,\,kcal\]                    \[\Delta E={{E}_{C{{O}_{2}}}}-({{E}_{C}}+{{E}_{{{O}_{2}}}})\]\[={{E}_{C{{O}_{2}}}}-(0+0)\]                                 or \[{{E}_{C{{O}_{2}}}}=\Delta E=-94\,\,kcal.\]


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