Step-by-step explanation:
Molecular formula is defined as the formula that represents the number of atoms of each element present in a particular compound.
For example, in one molecule of ethanol there are two carbon atoms, six hydrogen atoms and only one oxygen atom.
When there are more than one molecule of a substance or compound then we multiply it by the number of molecules we want or specified.
For example, two molecules of NaCl will be represented as 2NaCl.
Therefore, we can conclude that the molecular formula of one molecule of ethanol will be
or
.