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Stabiliti coeficientii urmatoarelor ecuatii :
  HCL + Mg = MgCl₂ + H₂
 Al + O₂ = Al₂O₃
CaCO₃ = CaO + CO₂
NaNO₃=NaNO₂+O₂


Răspuns :

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