Calculate the mass fraction of iron in ferric chloride (2) and ferric chloride (3).

Mass. the proportion of Fe in FeCl2 is 56: (56 + 35.5 * 2) * 100% = 44%.
Mass. the proportion of Fe in FeCl3 is 56: (56 + 35.5 * 3) * 100% = 34.5%.



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