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MgO + H2O Mg (OH) 2

SO2 + Mg(OH)2 + 5H2O MgSO36H2O

SO2+ MgSO36H2O Mg(HSO3)25H2O

Mg(HSO3)2 + MgO + 11H2O 2 MgSO36H2O

MgSO3 MgO + SO2

SO2 + O2  SO3

SO3 + H2O H2SO4

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