Ответ:

Объяснение:

4Al + 3O₂ = 2Al₂O₃

2Al + 3Cu(NO₃)₂ = 2Al(NO₃)₃ + 3Cu

Al₂O₃ + 6HCl = 2AlCl₃ + 3H₂O

2Al₂O₃ + 3H₂SO₄ = Al₂(SO₄)₃ + 6H₂O

AlCl₃ + 3KOH = 3KCl + Al(OH)₃↓

2Al(OH)₃ = Al₂O₃  + 3H₂O

2)

2Ba + O₂ = 2BaO

BaO + H₂O = Ba(OH)₂

Ba(OH)₂ + 2HCl = BaCl₂ + 2H₂O

3)

C + O₂ = CO₂

CO₂ + H₂O = H₂CO₃

H₂CO₃ + 2Na = Na₂CO₃ + H₂↑