We are given the compound: Fex[Fey(CN)6]3 and asked to find the values of x and y. Step 1. Identify familiar Prussian blue-type compounds Prussian blue and related compounds have the general formula: Fe4[Fe(CN)6]3 This often corresponds to a mixed-valence compound containing both Fe2+ and Fe3+ ions. Step 2. Match with the given general form Given formula: Fex[Fey(CN)6]3 If we compare: Fe4[Fe(CN)6]3 we identify: x=4,‌‌y=1
