Al(s) + H2SO4(aq) → Al2(SO4)3(aq) + H2(g)

What is the coefficient of H2 in the balanced equation, obtained by using oxidation numbers?

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  1. 2Al(s) + H2SO4(aq) → Al2(SO4)3(aq) + H2(g)
    ..0x2 = 0..2*1+ = 2.........2*3+ = 6..............0
    multiply Al half by 1 and multiply H2SO4/H2 half by 3 to give

    2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g)

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