Розстав коефіцієнти у наведених схемах хімічних реакцій:
1) Na + S →Na2S
2) Fe + Cl2 = FeCl3
3) N2 + Н2 → NH3
4) Ag + S = Ag2S
5) Ca + O2 = CaO
6) N2 + O2 = N2O5
7) Nа + О2 → Nа2О2
8) Fе + О2 → Fе3О4
9) FeBr3 + Cl2 = FeCl3 + Br2
10) P2O5 + H2O = H3PO4​
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