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Fe--Fe2O3--FeCI3--Fe(OH)3--Fe2(SO4)3
C--CO2--H2CO3--CaCO3--CaO
Fe--Fe2O3--FeCI3--Fe(OH)3--Fe2(SO4)3
C--CO2--H2CO3--CaCO3--CaO
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Fe⇒Fe₂O₃⇒FeCI₃⇒Fe(OH)₃⇒Fe₂(SO₄)₃4Fe + 3O₂=2Fe₂O₃
Fe₂O₃ + 6HCI= 2FeCI₃ + 3H₂O
FeCI₃ + 3NaOH=Fe(OH)₃↓+3NaCI
2Fe(OH)₃ + 3H₂SO₄=Fe₂(SO₄)₃ + 6H₂O
C⇒CO₂⇒H₂CO₃⇒CaCO₃⇒CaO
C +O₂=CO₂
CO₂ +H₂O⇄H₂CO₃
H₂CO₃ + Ca(OH)₂ = CaCO₃↓+2H₂O
CaCO₃ +t°= CaO +CO₂↑