H2SO3->S->H2S->S->ZnS
H2S->CuS
SO2->NaSO9->Na2SO4->BaSO4
H2SO4->Na2SO4
H2SO4->H2S
H2SO3=H2+SO+O2
H2+S=H2S
H2S+ZN=ZNS+H2
H2S+CU=CUS+H2
SO2+NAS= NASO3
NA2SO3+H2SO4=2NA2SO4+H2O+SO2
2NA2SO4+2BAOH=4NAOH+2BASO4
H2SO4+2NAOH=NA2SO4+H2O
3H2SO4=H2S+SO2+6H2O
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H2SO3=H2+SO+O2
H2+S=H2S
H2S+ZN=ZNS+H2
H2S+CU=CUS+H2
SO2+NAS= NASO3
NA2SO3+H2SO4=2NA2SO4+H2O+SO2
2NA2SO4+2BAOH=4NAOH+2BASO4
H2SO4+2NAOH=NA2SO4+H2O
3H2SO4=H2S+SO2+6H2O