Inspecting the oxidation states, reactants:
Al (s) → 0
O2 (g) → 0
O of Al2O3 → -2
Al of Al2O3:
2x+(3)(-2) = 0
2x-6 = 0
x = +3
For the oxidation-reduction reaction equation given here,
4Al + 3O2 --> 2Al2O3
indicate how many electrons are transferred in the formation of 1 formula unit of product.
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