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7.4.4
1.CaCO3 -----> CaO + O2
2.CaO + H2O ----> Ca(OH)2
3.Ca(OH)2 + CO2 ----> CaCO3 + H2O
7.4.5
1.2(CaSO4 * 2H2O) ----> (CaSO4)2 * H2O + 3H2O
2.(CaSO4)2 * H2O ----> 2(CaSO4 * 2H2O) + 3H2O
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