Answer:
Pure substance
Step-by-step explanation:
Molecule: contains more atoms of different elements. An example is CO2 molecule. So this option is wrong.
Compound: All compounds are molecules so this option is also wrong.
Mixture: Refers to the union of more than one substances that can be separated.
Chemical and Molecular formular: Represents the constituents of a molecule. This is wrong.
Pure substance: This is the correct option. For an object to be considered pure, it must be composed entirely of one compound.