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�џ��(y��ng)��CaCO₃→CaO + CO₂- 183 kJ/mol (1)

��򷴑�(y��ng)��CaO+SO₂ + 1/20₂→CaSO₄ + 486 kJ/mol (2)

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��(y��ng)��2CaS0₄+C→2CaO+2SO₂+CO₂(3)

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