Răspuns :
2HCL + Mg = MgCl₂ + H₂
4 Al + 3O₂ = 2Al₂O₃
CaCO₃ = CaO + CO₂ - o lasam asa, e deja egala
4NaNO₃=4NaNO₂+2O₂
4 Al + 3O₂ = 2Al₂O₃
CaCO₃ = CaO + CO₂ - o lasam asa, e deja egala
4NaNO₃=4NaNO₂+2O₂