Based on the balanced chemical equation shown below,determine the mass percent of Fe3+ in a 
sample of iron ore,if 22.40 mL of a 0.1000 M stannous chloride,SnCl2(aq) ,solution is required to completely react with the Fe3+ present in the ore sample.The chemical equation for the reaction is: 2 Fe3+(aq) + Sn2+(aq) → 2 Fe2+(aq) + Sn4+(aq) .
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