1) C+ ===========>CO
2) CO+ ============>CO2
3) CO2+ =========>CO2
4) CO2+ ===========> Ca(HCO3)2
5) CO2+ ===============>CaCO3
6) CaCO3=======>
7) CaCO3+ ============>Ca(HCO3)2
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Verified answer
1) 2С + O2 = 2CO
2) 2CO + O2 = 2CO2
3) ??????
4) CO2 + CaCO3 + H2O = Ca(HCO3)2
5) CO2 + Ca(OH)2 = CaCO3 + H2O
6) CaCO3 = CO2 + CaO
7) CaCO3 + CO2 + H2O = Ca(HCO3)2