Question

FeS2–SO2–SO3–H2SO4–SO2

Answer 1

4FeS2 + 11O2 --> 2F2O3 + 8SO2
2SO2 + O2 --> 2SO3
H2O + SO3 --> H2SO4
2H2SO4(конц.) + S --> 3SO2 + 2H2O

Answer 2

The chemical reaction you've mentioned involves the transformation of iron disulfide (FeS2) into sulfur dioxide (SO2), then to sulfur trioxide (SO3), followed by the formation of sulfuric acid (H2SO4), and finally back to sulfur dioxide (SO2).

Let's break down the reaction steps:

1. FeS2 (iron disulfide) is heated, undergoing the following reaction: FeS2(s) → FeS(l) + S(g) The iron disulfide decomposes into liquid iron sulfide and gaseous sulfur.

2. The sulfur gas (S) reacts with oxygen (O2) in the air, forming sulfur dioxide (SO2): S(g) + O2(g) → SO2(g) Sulfur combines with oxygen to produce sulfur dioxide gas.

3. Sulfur dioxide (SO2) is further oxidized to sulfur trioxide (SO3): 2SO2(g) + O2(g) → 2SO3(g) Sulfur dioxide reacts with oxygen to yield sulfur trioxide.

4. Sulfur trioxide (SO3) reacts with water (H2O) to form sulfuric acid (H2SO4): SO3(g) + H2O(l) → H2SO4(l) Sulfur trioxide combines with water to produce sulfuric acid.

5. Sulfuric acid (H2SO4) can undergo a reaction to yield sulfur dioxide (SO2): H2SO4(l) → H2O(l) + SO2(g) Sulfuric acid decomposes to form water and sulfur dioxide gas.

Overall, the reaction sequence you provided starts with iron disulfide (FeS2) and leads to the production of sulfur dioxide (SO2), sulfur trioxide (SO3), sulfuric acid (H2SO4), and again sulfur dioxide (SO2).