Worksheet for practicing balancing chemical equations with blank spaces for coefficients.

Here are the balanced chemical equations for the problems listed in your worksheet. I have worked through each one to ensure the number of atoms for every element is the same on both sides.

3) 2 NaCl + F₂ → 2 NaF + Cl₂
4) N₂ + 2 O₂ → 2 NO₂
5) Pb(OH)₂ + 2 HCl → 2 H₂O + PbCl₂
6) 2 AlBr₃ + 3 K₂SO₄ → 6 KBr + Al₂(SO₄)₃
7) CH₄ + 2 O₂ → CO₂ + 2 H₂O
8) C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O
9) C₈H₁₈ + 12.5 O₂ → 8 CO₂ + 9 H₂O
*(Note: If you need whole numbers, multiply everything by 2: 2 C₈H₁₈ + 25 O₂ → 16 CO₂ + 18 H₂O)*
10) FeCl₃ + 3 NaOH → Fe(OH)₃ + 3 NaCl
11) P₄ + 5 O₂ → 2 P₂O₅
12) 2 Na + 2 H₂O → 2 NaOH + H₂
13) 2 Ag₂O → 4 Ag + O₂
14) S₈ + 12 O₂ → 8 SO₃
15) 6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 O₂
16) K + MgBr₂ → 2 KBr + Mg *(Note: The original equation had K alone, but it needs a coefficient of 2 to balance the Br)*. Corrected: 2 K + MgBr₂ → 2 KBr + Mg
17) 2 HCl + CaCO₃ → CaCl₂ + H₂O + CO₂
18) HNO₃ + NaHCO₃ → NaNO₃ + H₂O + CO₂ *(This one was already balanced with coefficients of 1)*
19) H₂O + O₃ → H₂O₂ + O₂ *(This one is balanced as written)*
20) 2 NaBr + CaF₂ → 2 NaF + CaBr₂
21) H₂SO₄ + 2 NaNO₂ → 2 HNO₂ + Na₂SO₄

Final Answer:
3) 2 NaCl + F₂ → 2 NaF + Cl₂
4) N₂ + 2 O₂ → 2 NO₂
5) Pb(OH)₂ + 2 HCl → 2 H₂O + PbCl₂
6) 2 AlBr₃ + 3 K₂SO₄ → 6 KBr + Al₂(SO₄)₃
7) CH₄ + 2 O₂ → CO₂ + 2 H₂O
8) C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O
9) 2 C₈H₁₈ + 25 O₂ → 16 CO₂ + 18 H₂O
10) FeCl₃ + 3 NaOH → Fe(OH)₃ + 3 NaCl
11) P₄ + 5 O₂ → 2 P₂O₅
12) 2 Na + 2 H₂O → 2 NaOH + H₂
13) 2 Ag₂O → 4 Ag + O₂
14) S₈ + 12 O₂ → 8 SO₃
15) 6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 O₂
16) 2 K + MgBr₂ → 2 KBr + Mg
17) 2 HCl + CaCO₃ → CaCl₂ + H₂O + CO₂
18) HNO₃ + NaHCO₃ → NaNO₃ + H₂O + CO₂
19) H₂O + O₃ → H₂O₂ + O₂
20) 2 NaBr + CaF₂ → 2 NaF + CaBr₂
21) H₂SO₄ + 2 NaNO₂ → 2 HNO₂ + Na₂SO₄