Question

А почему H2S а не H2SO4

Answer 1

Это две разные кислоты. Первая - сероводородная кислота, вторая - серная кислота.

Answer 2

H2S is formed instead of H2SO4 in the reaction because the reactant FeS (iron sulfide) reacts with H2SO4 (sulfuric acid) to produce H2S (hydrogen sulfide) and FeSO4 (iron(II) sulfate). This reaction is a displacement reaction, where the more reactive element (hydrogen) displaces the less reactive element (sulfur) from the compound.

The balanced chemical equation for the reaction is: H2SO4 + FeS → H2S + FeSO4

The reason why H2S is formed instead of H2SO4 can be explained by the reactivity series of metals. Iron (Fe) is more reactive than hydrogen (H), so it displaces sulfur (S) from the sulfuric acid to form hydrogen sulfide (H2S) and iron(II) sulfate (FeSO4).

It's important to note that this reaction occurs under specific conditions and is not a general rule for all reactions involving sulfuric acid and sulfides.