Write the reaction equation S- SO2- SO3- H2SO4- Na2SO4

To carry out the above chain of transformations, we need to carry out four reactions.

The first reaction is the interaction of sulfur and oxygen in order to obtain tetravalent sulfur oxide. We write the reaction equation as follows:

S + O₂ = SO₂
The second reaction is the reaction of obtaining tetravalent six-valent sulfur oxide from sulfur oxide. To do this, we need to add oxygen to the original product. The chemical reaction equation is written as follows:

2 SO₂ + O₂ = 2 SO₃
The third reaction of obtaining hexavalent sulfuric acid from sulfur oxide, for this we need to carry out the interaction of the oxide with water. The molecular equation of the reaction can be written as follows:

SO₃ + H₂O = H₂SO₄
And the last reaction is the interaction of sulfuric acid and sodium hydroxide. The reaction forms a sodium sulfate salt and water is released.

H₂SO₄ + 2 NaOH = Na₂SO₄ + 2 H₂O.