Hydrogen sulfide Rotten-egg odor gas; toxic; weak acid 🏗️ Materials PDB source ↓ Drag to rotate · scroll to zoom 3D viewer requires JavaScript. Static renders available below. Structure Formula H2S Molecular weight 34.076 g/mol Heavy atoms 1 Total atoms 3 Composition H ×2 S ×1 SMILES S ⧉ Copy Class Inorganic