C => CO2 => H2CO3 => CaCO3 =>CO2

Question

C => CO2 => H2CO3 => CaCO3 =>CO2

Answer 1

1. C + O₂ = CO₂
2. CO₂ + H₂O = H₂CO₃
3. H₂CO₃ + CaCl₂ = CaCO₃ + 2HCl
4. CaCO₃ = CO₂ + CaO