Well, actually, no, but the phrase "dissociation of every molecule of iron" is a great deal stupider than you're suggesting. First of all, iron is an element, so a single atom of iron (which is, one might suppose - wrongly in this case - is what you get when you dissociate a molecule of iron) is still iron. However, it was never in molecules, because iron doesn't exist as molecules in the metallic state - metals are polycrystalline solids. The use of the word "molecule" to describe iron in the metallic state is an indicator, primarily, of a rather basic level of ignorance of materials science.
Dave