Ca(HCO3)2-CaCO3-CaO-CaC2-C2H2-C6H6-CO2

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This is a series of chemical reactions involving the compounds calcium bicarbonate (Ca(HCO3)2), calcium carbonate (CaCO3), calcium oxide (CaO), calcium carbide (CaC2), acetylene (C2H2), benzene (C6H6), and carbon dioxide (CO2).

Ca(HCO3)2 -> CaCO3 + CO2 + H2O
Calcium bicarbonate decomposes into calcium carbonate, carbon dioxide, and water.

CaCO3 -> CaO + CO2
Calcium carbonate decomposes into calcium oxide and carbon dioxide.

CaC2 + 2H2O -> C2H2 + Ca(OH)2
Calcium carbide reacts with water to produce acetylene and calcium hydroxide.

2C2H2 + 5O2 -> 4CO2 + 2H2O
Acetylene combusts in the presence of oxygen to produce carbon dioxide and water.

2C6H6 + 15O2 -> 12CO2 + 6H2O
Benzene combusts in the presence of oxygen to produce carbon dioxide and water.

Overall, the reactions involve the decomposition of calcium bicarbonate and calcium carbonate, the formation of acetylene from calcium carbide, and the combustion of acetylene and benzene to produce carbon dioxide and water.