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5 January, 23:16

Fe2O3 + H2SO4à Fe2 (SO4) 3 + H2O For this unbalanced chemical equation, what is the coefficient for water when the equation is balanced?

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  1. 6 January, 00:02
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    3

    Explanation:

    Put a 1 in front of the most complicated-looking formula [Fe₂ (SO₄) ₃]:

    Fe₂O₃ + H₂SO₄ ⟶ 1Fe₂ (SO₄) ₃ + H₂O

    Balance Fe:

    Put a 1 in front of Fe₂O₃.

    1Fe₂O₃ + H₂SO₄ ⟶ 1Fe₂ (SO₄) ₃ + H₂O

    Balance S:

    Put a 3 in front of H₂SO₄.

    1Fe₂O₃ + 3H₂SO₄ ⟶ 1Fe₂ (SO₄) ₃ + H₂O

    Balance O.

    We have fixed 15 O on the left but only 12 O on the right. Put a 3 in front of H₂O.

    1Fe₂O₃ + 3H₂SO₄ ⟶ 1Fe₂ (SO₄) ₃ + 3H₂O

    Every formula now has a coefficient. The equation should be balanced.

    Check:

    Atom On the left On the right

    Fe 2 2

    O 15 15

    H 6 6

    S 3 3

    The balanced equation is

    Fe₂O₃ + 3H₂SO₄ ⟶ Fe₂ (SO₄) ₃ + 3H₂O

    The coefficient of H₂O is 3.
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