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Fe=3+ ,Cl=1-
Dalam senyawa Al memiliki bilangan oksidasi +3
2Al + 3S +12O = 0
2(+3) + 3S + 12(-2) = 0
6 + 3S - 24 = 0
3S - 18 = 0
3S = 18
S = 18/3
S = +6
FeCl3
Cl jika bersenyawa dengan logam akan memiliki bilangan oksidasi -1
FeCl3
Fe + 3Cl = 0
Fe + 3(-1) = 0
Fe - 3 = 0
Fe = +3