Расставить коэффициенты и указать тип реакций H2S + O2 = S + H2O
KClO3 = KCl + O2
Cu(NO3)2 + KOH = KNO3 + Cu(OH)2
Fe + O2 = Fe3O4
BaCl2 + Na2SO4 = BaSO4 + NaCl
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