Write the reaction equation: CaO- X- Na2CO3- CaCO3- CO2

CaO + CO2 => CaCO3;
CaCO3 + Na2S => Na2CO3 + CaS;
Na2CO3 + CaCl2 => CaCO3 + 2NaCl;
CaCO3 => CaO + CO2.



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