Here's why:

* Hexane's molecular formula is C₆H₁₄. This tells us there are 6 carbon atoms and 14 hydrogen atoms in each molecule.

* An empirical formula represents the simplest whole number ratio of atoms in a compound.

* To find the empirical formula, we need to find the greatest common factor (GCD) of the subscripts in the molecular formula. The GCD of 6 and 14 is 2.

* Dividing both subscripts in C₆H₁₄ by 2 gives us CH₃, which is the empirical formula of hexane.