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N=N + 3 H-H ------- 2H-N-H
l
H
-46 = ((EN=N +3(EH-H))-(2.3.EN-H)
-46 = (EN=N +3(436))-(6(391))
-46= (EN=N +1038-2346)
EN=N = -46-1038+2346
= 1262 kj/mol