Balance an equation3 steps · change only the big numbers
- Count the atoms on each side. Every big number is 1 for now. Count each kind of atom in the reactants on the left and in the products on the right.
- Balance it with the big numbers. Make the two bars for each element equal. Change only the big numbers in front. The small numbers are locked.
- H₂ + O₂ → H₂O: Balanced: 2 H₂(g) + O₂(g) → 2 H₂O(g)
- Mg + O₂ → MgO: Balanced: 2 Mg(s) + O₂(g) → 2 MgO(s)
- Na + Cl₂ → NaCl: Balanced: 2 Na + Cl₂ → 2 NaCl
- Li + H₂O → LiOH + H₂: Balanced: 2 Li + 2 H₂O → 2 LiOH + H₂
- Al + S → Al₂S₃: Balanced: 2 Al + 3 S → Al₂S₃
- Cs + N₂ → Cs₃N: Balanced: 6 Cs + N₂ → 2 Cs₃N
- NH₃ + O₂ → N₂ + H₂O: Balanced: 4 NH₃ + 3 O₂ → 2 N₂ + 6 H₂O
- H₃PO₄ + KOH → K₃PO₄ + H₂O: Balanced: H₃PO₄ + 3 KOH → K₃PO₄ + 3 H₂O
- Al(OH)₃ + HBr → AlBr₃ + H₂O: Balanced: Al(OH)₃ + 3 HBr → AlBr₃ + 3 H₂O
- H₃PO₄ + Mg(OH)₂ → Mg₃(PO₄)₂ + H₂O: Balanced: 2 H₃PO₄ + 3 Mg(OH)₂ → Mg₃(PO₄)₂ + 6 H₂O
- CH₄ + O₂ → CO₂ + H₂O: Balanced: CH₄ + 2 O₂ → CO₂ + 2 H₂O
- C₂H₆ + O₂ → CO₂ + H₂O: Balanced: 2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O
- C₃H₈ + O₂ → CO₂ + H₂O: Balanced: C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O
- Same atoms before and after. Same atoms before and after, so the mass is the same.
Try it with: