Chemistry : Balancing Chemical Equations

What numbers are needed in the blanks to balance the following chemical equations?
Type these numbers separated by commas with no spaces in the answer.
Example :
Word Equation : Sulfur + Sulfuric acid → Sulfur dioxide + Water
Molecular Equation : _______ S + _______ H₂SO₄ → _______ SO₂ + _______ H₂O
Balanced Equation : S + 2 H₂SO₄ → 3 SO₂ + 2 H₂O
Answer : 1,2,3,2

Formats

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Fill in the blanks

Your Performance

1.
_______ KBr + _______ Cl₂ → _______ KCl + _______ Br₂

Hint

Hint

2.
_______ ZnS + _______ O₂ → _______ ZnO + _______ SO₂

Hint

3.
_______ NaOH + _______ H₂SO₄ → _______ Na₂SO₄ + _______ H₂O

Hint

4.
_______ Fe + _______ O₂ → _______ Fe₂O₃

Hint

5.
_______ Al + _______ Cl₂ → _______ AlCl₃

Hint

6.
_______ Al + _______ H₂SO₄ → _______ Al₂(SO₄)₃ + _______ H₂

Hint

7.
_______ HgO → _______ Hg + _______ O₂

Hint

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