How is an empirical formual like and unlike a molecular formula?

Answer 1

Both an empirical formula and a molecular formula show the specific elements that make up the molecule.

The primary difference between an empirical formula and a molecular formula is that the empirical formula shows the simplest whole number ratio of the elements. (In some cases these formulas will be identical.)

For example:
The molecular formula of water is H2O.
The empirical formula of water is H2O.

The molecular formula of hydrogen peroxide is H2O2.
The empirical formula of hydrogen peroxide is HO.

Answer 2

I believe empirical formula are alike molecular formulas because they involve finding the grams of element.
They are different because empirical is to find the mole ratio or as we may call it the compound formula. Molecular is finding the mass, or the percent mass which usually adds up to 100!