oxidation number of Al3 SO4 3
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aluminum, sulfur and oxygen. If your looking for the addition reaction for the formation of Aluminum sulfate this is equation:
Al(+3) + SO4(-2) = Al2(SO4)3
Aluminum has an oxidation number of +3 and sulfate, a polyatomic ion, has an oxidation number of -2 not -3.
Balancing the Equation gives 2Al + 3SO4 = Al2(SO4)3
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