3. г
4. Ca-CaO-Ca(OH)2-CaSO4
2Ca+O2=2CaO
CaO+H2O=Ca(OH)2
Ca(OH)2+SO3=H2O+CaSO4
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3. г
4. Ca-CaO-Ca(OH)2-CaSO4
2Ca+O2=2CaO
CaO+H2O=Ca(OH)2
Ca(OH)2+SO3=H2O+CaSO4