tolong No 10 sampai 15 kk

10. PO4 = -3
P(-2×4) = -3
P-8 = -3
P= 8-3
P= +5

11. P2O5 =0
P2(-2×5) =0
P2 = 10
P= 10/2
P= +5

12. NO2 = -1
N (-2×2) = -1
N= 4-1
N= +3

13. Na2SO4=0
1×2 S -2×4 =0
2+S-8 = 0
S= 8-2
A= +6

14. CrCl3 =0
Cr -3 = 0
Cr= +3

15. Mn(OH)2
Mn= +2

-2 H= -1
H= +1