S -> SO2 -> H2SO3 -> MgSO3
1) S + O2 = SO2
2) SO2 + H2O = H2SO3
3) H2SO3 + Mg(OH)2 = MgSO3 + 2H2O
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S -> SO2 -> H2SO3 -> MgSO3
1) S + O2 = SO2
2) SO2 + H2O = H2SO3
3) H2SO3 + Mg(OH)2 = MgSO3 + 2H2O