1. Convert masses to moles:

* Iron (Fe): 55.85 g Fe / 55.845 g/mol Fe = 1.000 mol Fe

* Chlorine (Cl): 106.5 g Cl / 35.45 g/mol Cl = 3.000 mol Cl

2. Find the mole ratio:

* Divide the number of moles of each element by the smallest number of moles:

* Fe: 1.000 mol / 1.000 mol = 1

* Cl: 3.000 mol / 1.000 mol = 3

3. Write the empirical formula:

* The mole ratio indicates there is 1 iron atom for every 3 chlorine atoms.

* The empirical formula is FeCl₃