расставьте коэффициенты, пожалуйста.
1)MgCO3 →CO2↑+MgO
2)CuO+Al→Cu+Al2O3
3)NO+O2→NO2
4)ZnO+H2→Zn+H2O
5)HCl+NaOH→NaCl+H2O
6)BaCl2+Na2SO4→BaSO4↓+NaCl

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