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11th Class Physics Thermodynamical Processes Question Bank Critical Thinking

  • question_answer
    The \[{{H}_{2}}O(g)\] molecule dissociates as                 (i)  \[{{H}_{2}}O(g)\to H(g)+OH(g);\,\Delta H=490\,kJ\]                 (ii) \[OH(g)\to H(g)+O(g);\,\Delta H=424\,kJ\]                 The average bond energy (in kJ) for water is

    A)                 490        

    B)                 424

    C)                 914        

    D)                 914/2

    Correct Answer: D

    Solution :

              eq. (i) + eq. (ii) find the required result and divide by 2.


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