Which of the following corresponds to the formula CO2?

The formula CO2 corresponds to carbon dioxide. This is because the chemical formula indicates that there is one carbon atom (C) and two oxygen atoms (O) bonded together. In nomenclature, the prefix "di-" is used to denote that there are two of a particular atom, which is why it's named carbon dioxide. This distinction is important because it indicates the presence of two oxygen atoms in relation to the single carbon atom, a defining characteristic of the compound.

On the other hand, carbon monoxide has only one oxygen atom and is represented by the formula CO. Methane, which is a simple hydrocarbon, has the formula CH4, indicating one carbon atom and four hydrogen atoms. Glucose, a type of sugar, has a much more complex structure and is represented by the formula C6H12O6. Thus, carbon dioxide is the only choice that accurately matches the given formula, CO2.