H2O

3Fe + 4H₂O ⟶ Fe₃O₄ + 4H₂↑

Al(OH)₃ + NaOH → 2H₂O + NaAlO₂

C₂H₂ + H₂O → CH₃CHO

Ca(HCO₃)₂ + 2HCl → 2H₂O + 2CO₂ + CaCl₂

2Cu + H₂O + O₂ + CO₂ → Cu₂CO₃(OH)₂

Al₂O₃ + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂O

Al + 6HNO₃ → 3H₂O + 3NO₂ + Al(NO₃)₃

BaO + H₂O → Ba(OH)₂

2Al(OH)₃ → Al₂O₃ + 3H₂O

(NH₄)₂Cr₂O₇ → 4H₂O + N₂ + Cr₂O₃