H2S→S→SO2→Na2SO3→Na2SO4
H2S = H2 +SS + O2 - SO2 SO2+2NaOH=Na2SO3+H2O
Na 2 SO 3 + H 2 SO 4 = Na 2 SO 4 + SO 2 +H 2 O
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H2S = H2 +S
S + O2 - SO2
SO2+2NaOH=Na2SO3+H2O
Na 2 SO 3 + H 2 SO 4 = Na 2 SO 4 + SO 2 +H 2 O