2H2S+3O2=>2SO2+2H2O
SO2+Na2O=>Na2SO3
Na2SO3+Ba(OH)2=>2NaOH+BaSO3
BaSO3=>BaO+SO2
2SO2+O2=>2SO3
SO3+H2O=>H2SO4
Pb+H2SO4=>PbSO4+H2
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2H2S+3O2=>2SO2+2H2O
SO2+Na2O=>Na2SO3
Na2SO3+Ba(OH)2=>2NaOH+BaSO3
BaSO3=>BaO+SO2
2SO2+O2=>2SO3
SO3+H2O=>H2SO4
Pb+H2SO4=>PbSO4+H2