Although we usually think of substances as "burning" only in oxygen gas, the process of rapid oxidation to produce a flame may also take place in other strongly oxidizing gases. For example, when iron is heated and placed in pure chlorine gas, the iron "burns" according to the following (unbalanced) reaction:

Fe (s) + Cl₂ (g) -> FeCl3 (s)

How many grams of iron(III) chloride (FeCl3) result when 15.5 g of iron (Fe) is reacted with an excess of chlorine gas? Balance the equation first.​