Water Universal solvent; product of combustion/neutralization 🏗️ Materials PDB source ↓ Drag to rotate · scroll to zoom 3D viewer requires JavaScript. Static renders available below. Structure Formula H2O Molecular weight 18.015 g/mol Heavy atoms 1 Total atoms 3 Composition H ×2 O ×1 SMILES O ⧉ Copy Class Inorganic