Explanation:
A molecule is defined as a substance which contains chemically bonded same type of elements.
For example, [tex]H_{2}[/tex] is a molecule and it exists as a gas which is colorless and odorless.
Hydrogen gas is represented as [tex]H_{2}[/tex].
Whereas a compound is defined as a substance which contains chemically bonded different type of elements in a fixed ratio by mass.
For example, [tex]NO_{2}[/tex] is a compound and has a reddish brown color with toxic odor.
Nitrogen dioxide is represented as [tex]NO_{2}[/tex].
