Автор - vovatruxin

Ca →CaO → Ca(OH)2 → CaCl2 → CaSO4→ CaSO3

Ответ

Автор - anikeev2012
2Ca+O2=2CaO 
CaO+H2O=Ca(OH)2 
Ca(OH)2+2HCl=CaCl2+2H2O 
CaCl2+H2SO4=CaSO4+2HCl
CaSO4 + Na2CO3 = CaCO3↓ + Na2SO4

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