This is the equation I am supposed to write and balance: The formation of solid iron (III) chloride from its elements. I tried to write it like this- 3Fe + 2Cl = 2FeCl3 But my teacher then asked: How does chlorine exist as an element?What I mean is if I have a container full of chlorine at room temperature the chlorine exists as Cl2 molecules . Other nonmetals also exist like this such as O2 and N2. I'm not sure what this means and how to solve the equation. Can someone help please?