2Сa + O2 = 2CaO CaO + H2O + Ca(OH)2 Ca(OH)2 + SO3 = CaSO4 + H2O
Ca-CaO-Ca(OH)2-CaSO4
1)2Ca+O2=2CaO
2)CaO+H2O=Ca(OH)2
3)Ca(OH)2+H2SO4=CaSO4+2H2O