S -¹-> So2 -²-> So3 -³-> H2So4 -⁴-> Na2So4
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1. S + O2 = SO2
2. 2SO2 + O2 = 2SO3
3. SO3 + H2O = H2SO4
4. H2SO4 + 2 NaOH = Na2SO4 + 2 H2O
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Verified answer
S -¹-> So2 -²-> So3 -³-> H2So4 -⁴-> Na2So4
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1. S + O2 = SO2
2. 2SO2 + O2 = 2SO3
3. SO3 + H2O = H2SO4
4. H2SO4 + 2 NaOH = Na2SO4 + 2 H2O