Iron reacts rapidly with chlorine gas to form Compound A, a reddish-brown ionic compound, which contains iron?

in the higher of its two common oxidation states. Strong heating decomposes Compound A to Compound B, another ionic compound, which contains iron in the lower of its two oxidation states. When Compound A is formed by the reaction of 56.6 g Fe and 88.8 g Cl2 and then heated, how much Compound B forms?