Расставьте коэффициенты в следующих схемах реакций: Н-р: Мg + O2 = MgO
2 Мg + O2 = 2MgO
коэффициенты

Mg + HCl = MgCl2 + H2
PbO + Al = Al2O3 + Pb
Fe2O3 + H2= H2O + Fe
Zn + FeBr3 = ZnBr2 + Fe
HCl + Al = AlCl3 + H2
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