Propane LPG fuel; bottled gas 🧪 Building Blocks PDB source ↓ Drag to rotate · scroll to zoom 3D viewer requires JavaScript. Static renders available below. Structure Formula C3H8 Molecular weight 44.097 g/mol Heavy atoms 3 Total atoms 11 Composition C ×3 H ×8 SMILES CCC ⧉ Copy Class Alkane