Расставьте коэффициенты в схемах химических реакций:



С + Al → Al4C3 Fe + HCl → FeCl2 + H2



H2O → H2 + O2 S + O2 → SO3

K2O + H2O → KOH N2O5 + H2O → HNO3

Zn + O2 → ZnO C2H4 + O2 → CO2 + H2O

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