The equations are balanced.
Explanation:
H₂ + Br₂ → 2HBr
Na₂O + H₂O → 2NaOH
3H₂ + N₂ → 2NH₃
2MClO₃ →2MCl+ 3O₂
2H₂O₂ → 2H₂O + O₂
1 H₂CO₃ → 1 H₂O + 1 CO₂
CH₄(g) + 2O₂ →CO₂ + 2H₂O
2C₂H₆ + 7O₂→ 4CO₂ + 6H₂O
C₁₀H₈ + 12O₂→ 10CO₂ + 4H₂O
2HCl + Zn → ZnCl₂ + H₂
3F₂ + 2FeI₃ → 2FeF₃ + 3 I₂
Zn + Fe(NO₃)₂→ Zn(NO₃)₂ + Fe
CuCl₂ + 2AgNO₃→ Cu(NO₃)₂ + 2AgCl
2K₃PO₄ + 3SrCl₂→ Sr₃(PO₄)₂ + 6KCl
3Fe(NO₃)₂ + 2Na₃PO₄ →Fe₃(PO₄)₂ + 6NaNO₃
