осуществить превращение 
1. S -> H2S
2. H2S ->SO2
3. SO2-> H2SO3
4. H2SO3-> CaSO3
5. S -> SO2
6. SO2 ->SO3
7. SO3->H2SO4
8. H2SO4->BaSO4
К ОВР составить эл. баланс
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