Доберіть коефіцієнти:
1) Fe + HCl →FeCl2 + H2
2) N2O5 → NO2 + O2
3) Pb + O2 → PbO
4) CaCO3 → CaO + CO2
5) KBr + Cl2 → KCl + Br2
6) Fe(OH)3 + HCl → FeCl3 + H2O
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