Make the equation: CO-CO2-Na2CO3-CO2-BaCO3

This chain of transformations can be carried out as follows:
1) 2CO + O2 = 2CO2
2) CO2 + Na2O = Na2CO3
3) Na2CO3 + 2HCl = 2NaCl + CO2 + H2O
4) Ba (OH) 2 + CO2 = BaCO3 + H2O



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