試題詳解

64. The iron in a 0.6656-g ore sample was reduced quantitatively to the +2 state and then titrated with 26.75 mL of the KMnO₄ solution (0.02966 M). Calculate the percentage of Fe₂O₃ (Fe=55.8 g/mol) in the sample.
(A) 95.12 %
(B) 47.56 %
(C) 43.12 %
(D) 38.04 %
(E) 19.02 %