To correctly describe a model of methanol (CH3OH), we can break down the molecular formula:
- **C (carbon)**: 1 atom → 1 gray sphere
- **H (hydrogen)**: 3 atoms → 3 white spheres
- **O (oxygen)**: 1 atom → 1 red sphere
Putting this together, a model of methanol, CH3OH, would consist of:
- 1 gray sphere (for carbon)
- 3 white spheres (for hydrogen)
- 1 red sphere (for oxygen)
Thus, the option that correctly describes a model of methanol is:
**one gray sphere, three white spheres, one red sphere.**