Ответ:
СаО+Н2S=CaS+H2O
Na2O+H2S=Na2S+H2O
CaO+H2O=ca+(oh) 2
Na2O+H2O=naoh+o2
Ca+o2=cao2
Cu+o2=cao2
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Ответ:
СаО+Н2S=CaS+H2O
Na2O+H2S=Na2S+H2O
CaO+H2O=ca+(oh) 2
Na2O+H2O=naoh+o2
Ca+o2=cao2
Cu+o2=cao2