Кр срочно помогите _H2S + _O2 = _SO2 + _H20
_H2O2 = _H2O + _02
_FeO + _O2 = _Fe2O3
_H2S + _SO2 = _S + _H2O
_PbCl2 + _Na2S = _PbS + _NaCl
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