What is the chemical formula for hydrogen sulfide gas?

The chemical formula for hydrogen sulfide gas is indeed H2S. This formula accurately represents that each molecule of hydrogen sulfide is composed of two hydrogen atoms and one sulfur atom.

In the molecular structure of hydrogen sulfide, the presence of two hydrogen atoms (H) bonded to one sulfur atom (S) exemplifies its dihydrogen mon sulfide composition, which is the basis for its name. The subscript "2" next to hydrogen indicates that there are two hydrogen atoms, while the absence of a subscript next to sulfur implies there is one sulfur atom present.

This structure is consistent with the properties of hydrogen sulfide, a colorless gas known for its characteristic smell of rotten eggs, and plays significant roles in various chemical processes and applications. Understanding molecular formulas like H2S helps in identifying compounds and predicting their behavior in chemical reactions.