N-H is -389 not -386. Minor typo you had and probably why you got the wrong answer the first time.Hm... I have gotten +109 as my final answer..
Cuz.. you have to break the triple bond of N2, which is +941, and break two H2 bonds which are +436 each.. So that comes out to be +1812..
Then you have to make single N2 bond, which is -159, and make 4 N-H bond, which is -386 each..
So I think total is +109.
Maybe I am completely wrong
Can anyone please post the correct answer?