8. Розставте коефіцієнти в схемах хімічних реакцій: a) CO+O2 → СО б) Zn + HCl →ZnCl2 + H2 в) Fe2O3 + HCl → FeCl3 + H2O г) KMnO4 → K2MnO4 + MnO2 + O2 ​
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