Jawabanmu

2014-05-27T23:32:20+07:00
Zn(NO3)2
BO Zn + 2 BO N + 6 BO O = 0
(+2) + 2 BO N + 6(-2) = 0
(+2) + 2 BO N + (-12) = 0
2 BO N = 10
BO N = +5

BO Zn = +2
BO N = +5
BO O = -2