№ 1. Расставьте коэффициенты в следующих схемах реакций:
1) Pb + O2 → PbO
2) Li + N2 → Li3N
3) Ag + S → Ag2S
4) Na + O2 → Na2O
5) P + O2 → P2O3
6) Fe2O3 + H2 → Fe + H2O
7) Al + CuCl2 → AlCl3 + Cu
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