tentukan bilangan oksidasi atom Cr,S,dan O pada Cr2(SO4)3

Bab Redoks
Kimia SMA Kelas X

Biloks Cr
2Cr + 3S + 12O = 0
2Cr + 3(-2) + 12(-2) = 0
2Cr - 6 - 24 = 0
2Cr - 30 = 0
2Cr = +30
Cr = +15

Biloks S
2Cr + 3S + 12O = 0
2(2) + 3S + 12(-2) = 0
4 + 3S - 24 = 0
3S - 20 = 0
3S = 20
S = + 20/3

Biloks O
2Cr + 3S + 12O = 0
2(2) + 3(-2) + 12O = 0
4 - 6 + 12O = 0
12O - 2 = 0
12O = 2
O = + 2/12