Answer:Explanation:We can assume that this is a neutral compound, meaning the charges of the ions are balanced.We are given: Iron (III) Bromide.We want to find the chemical formula.First, find the symbols of the elements.Fe: IronBr: BromineNext, find the charges on the ions.The Roman Numeral 3 in parentheses (III). This indicates the iron cation has a charge of +3.We need to balance out the charge of +3 with the bromine. Bromine can have a charge of +5, +1, and -1. Since we already have a cation (positive ion), bromine must be an anion (negative ion). We also know the charge must be negative to balance out the compound.But, the charge is only -1. That would still leave the compound unbalanced. Therefore, we must have 3 bromine atoms to balance out the iron. The 3 will become a subscript.So, put all the information together and write the formula:FeBr₃...

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