Jawabanmu

2014-06-06T12:24:29+07:00
A. H + N + 2O=0
(+1)+N + 2(-2)=0
(+1) + N +(-4)=0
N+(-3)=0
N=0+3
N=3

b N+3O=(-1)
N+ 3(-2)=(-1)
N +(-6)=(-1)
N=(-1)+6
N=5

c. N+4H=+1
N+4(+1)=+1
N+4=+1
N=+1-4
N= -3