5. Solving a chemistry problem
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5. Solving a chemistry problem
2. A 0.2133 g sample of ore was dissolved in hydrochloric acid, the formed iron (111) was reduced to iron (II) and then 17.20 cm3 of a KMnO4 solution was titrated with 1/5 KMnO4 = 0.117 N. Calculate the mass fraction of iron in this ore.
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