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JEE Main & Advanced AIEEE Solved Paper-2006

  • question_answer
    The standard enthalpy of formation \[(\Delta H_{f}^{o})\] at 298 K for methane,\[C{{H}_{4}}(g),\]is \[-74.8\text{ }kJ\text{ }mo{{l}^{-1}}\] The additional information required to determine the average energy for\[CH\] bond formation would be     AIEEE  Solved  Paper-2006

    A)  the dissociation energy of Hg and enthalpy of sublimation of carbon

    B)  latent heat of vaporisation of methane

    C)  the first four ionisation energies of carbon and electron gain enthalpy of hydrogen

    D)  the dissociation energy of hydrogen molecule,\[{{H}_{2}}\]

    Correct Answer: A

    Solution :

    Carbon is found in solid state. The state of substance affects the enthalpy change. \[C(s)\xrightarrow{{}}C(g)\] sublimation and    \[{{H}_{2}}(g)\xrightarrow{{}}2H(g)\]dissociation are required to determine the average energy for\[CH\]bond formation.


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