Answer:
3
Explanation:
Al + CuSO₄ → Al₂(SO₄)₃ + Cu
two aluminum atoms in products. put 2 in front of Al in reactants.
2 Al + CuSO₄ → Al₂(SO₄)₃ + Cu
three sulfur atoms and twelve oxygen atoms in products. put 3 in front of CuSO₄ in reactants.
2 Al + 3 CuSO₄ → Al₂(SO₄)₃ + Cu
three copper atoms in reactants. put 3 in front of Cu in products.
2 Al + 3 CuSO₄ → Al₂(SO₄)₃ + 3 Cu
The equation is balanced. Hope that helps.
