S + O2 = SO2
2SO2 + O2 = 2SO3
K2O + SO3 = K2SO4
K2SO4 + Ba(OH)2 = 2KOH + BaSO4
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S + O2 = SO2
2SO2 + O2 = 2SO3
K2O + SO3 = K2SO4
K2SO4 + Ba(OH)2 = 2KOH + BaSO4