## Chemistry: Molecular Approach (4th Edition)

Gaseous carbon dioxide is represented by the molecules of $\text{C}{{\text{O}}_{2}}$ . Therefore, option (c) is correct.
The chemical reaction for the sublimation of dry ice is $\text{C}{{\text{O}}_{2}}(\text{s}) \to \text{C}{{\text{O}}_{2}}(\text{g})$ Sublimation is a physical change, so the composition of dry ice will remain the same. Option (c) represents the molecules of $\text{C}{{\text{O}}_{2}}$ so it is the best representation.