расставьте коэффициенты в уравнениях реакций:
1. Fe + O2 -> Fe3O4
2. Li + O2 -> Li2O
3. Al + Cl2 -> AlCl3
4. P + O2 -> P4O10
5. Na + S -> Na2S
6. Zn + O2 -> ZnO
7. Al + C -> Al4C3
8. H2 + Br2 -> HBr
9. H2 + O2 -> H2O
10. N2 + H2 -> NH3
11. Fe + Cl2 -> FeCl3
12. Na + H2 -> NaH
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