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. \[{{\alpha }_{1}}=3{{\alpha }_{2}}\]
• D.   914/2