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Consider the following data : Delta(f)H^...

Consider the following data : `Delta_(f)H^(@)(N_(2)H_(4),l)=50kJ//mol,Delta_(f)H^(@)(NH_(3),g)=-46kJ//mol`
`B.E(N-H)=393" kJ//mol and B.E."(H-H)=436kJ//mol`
`Delta_("vap")H(N_(2)H_(4),l)=18kJ//mol`
The N-N bond energy in `N_(2)H_(4)` is :

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