Расставьте коэффициенты в уравнениях химических реакций


1. Mg + O2 → MgO
2. Cu(OH)2 → CuO + H2O
3. P + Cl2 → PCl5
4. (NH4)2Cr2O7 → N2 + Cr2O3 + H2O
5. Pb(NO3)2 → PbO + NO2 + O2
6. KNO3 → KNO2 + O2
7. Li + N2 → Li3N
8. B + O2 → B2O3
9. H3BO3 → B2O3 + H2O
10. Li + O2 → Li2O
11. Fe(OH)3 → Fe2O3 + H2O
12. NO2 + O2 + H2O → НNO3
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