Ca →H2O → X1 →CO2 CaCO3 →t° X2 →H2O X3 →HCl X4 → Ca

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вопрос

The chemical reactions you have described involve the decomposition of calcium carbonate (CaCO3) into calcium oxide (CaO) and carbon dioxide (CO2) with the formation of water (H2O). The calcium oxide then reacts with water to form calcium hydroxide (Ca(OH)2), which can further react with hydrochloric acid (HCl) to form calcium chloride (CaCl2) and water.

Overall, the reactions can be summarized as follows:

1) CaCO3 → CaO + CO2
2) CaO + H2O → Ca(OH)2
3) Ca(OH)2 + HCl → CaCl2 + H2O

The final product in the reactions would be calcium chloride (CaCl2) along with the regeneration of calcium (Ca).