1.Розставте коефіцієнти у хімічних рівняннях. (0,5 балів)
1 Мg + O2 = MgO
2 S + O2 = SO3
3 Al + O2= Al2O3
4 C + O2= CO2
5 Na2O + H2O = Na(OH)
6 SO3 + H2O= H2SO4
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