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9. Розставте коефіцієнти у рівняннях реакцій, підкресліть реакцію добування кисню: a) Mg + O2 = MgO б) C2H4+ O2 = CO2 + H2O в) Fe + O2 = Fe3O4 г) Н2О2 = H2O + O2↑​
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