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Hydrazine , N(2)H(4) , contains aN-N sin...

Hydrazine , `N_(2)H_(4) ,` contains aN-N single bond and 4N -H bonds . Use bond energies to calculate `DeltaH`in KJ for the reaction :
`N_(2)+2H_(2)toN_(2)H_(4)`
`{:(Bond ,"Energies" (KJ.mol^(-1))),(H-H,436),(H-N,386),(N-N,193),(N=N,418),(N-=N,941):}`

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