Write the reaction equation: S- H2S- SO2- Na2SO3- BaSO3- SO2

1) S + H2 = H2S (when sulfur reacts with hydrogen, hydrogen sulfide is formed);

2) 2H2S + 3O2 = 2H2O + 2SO2 (when hydrogen sulfide interacts with oxygen, water and sulfur oxide are formed);

3) SO2 + Na2O = Na2SO3 (when sulfur oxide interacts with sodium oxide, sodium sulfite is formed);

4) Na2SO3 + Ba (OH) 2 = BaSO3 + 2NaOH (when sodium sulfite and barium hydroxide react, barium sulfite and sodium hydroxide are formed);

5) BaSO3 = BaO + SO2 (when barium sulfite decomposes, barium oxide and sulfur oxide are formed).