Barium sulfate was fused with coke. The solid residue was dissolved in hydrochloric acid, the released gas reacted with sulfur

Barium sulfate was fused with coke. The solid residue was dissolved in hydrochloric acid, the released gas reacted with sulfur (IV) oxide, and the solution with sodium sulfate. Write the equations for the described reactions.

BaSO4 + 4C → BaS + 4CO ↑
BaS + 2HCl → BaCl2 + H2S ↑
2H2S + SO2 → 2H2O + 3S
BaCl2 + Na2SO3 → BaSO3 ↓ + 2NaCl

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