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JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank Bond energy

  • question_answer
    If enthalpies of methane and ethane are respectively 320 and 360 calories then the bond energy of \[C-C\] bond is [UPSEAT 2003]

    A)                 80 calories          

    B)                 40 calories

    C)                 60 calories          

    D)                 120 calories

    Correct Answer: B

    Solution :

           \[C{{H}_{4}}\to C+4H,\,\,\Delta H=320\]            \[{{E}_{C-H}}=90\,cal\]            \[{{C}_{2}}{{H}_{6}}\to 2C+6H,\,\,\,\Delta H=360\]            \[\therefore 360={{E}_{C-C}}+6{{E}_{C-H}}\]                 \[\therefore {{E}_{C-C}}=360-320=40\,\,cal\].


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