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NH₃ + H₂O + ��� = NH₃•H2O

2NH₃(��) + H₂O(��) + SO₂(��) + 1/2O₂= (NH₄)₂SO₄

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(NH₄)₂SO₄+ Ca(OH)₂+ 2H₂O = CaSO₄•2H₂O↓ + 2NH₃•H₂O

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