Fe²⁺(aq)reacts with MnO₄^-(aq)ion in Acidic Solution to Yield Fe³⁺(aq)ions and Mn²⁺(aq)ions

Multiple Choice

Fe²⁺(aq) reacts with MnO₄^-(aq) ion in acidic solution to yield Fe³⁺(aq) ions and Mn²⁺(aq) ions. 5Fe²⁺(aq) + MnO₄^-(aq) + 8H⁺ $\rarr$ 5Fe³⁺(aq) + Mn²⁺(aq) + 4H₂O Melanterite is a greenish mineral, and can be found on the walls of mines. A sample of melanterite, FeSO₄·7H₂O, was analyzed for purity using this reaction by titration of an aqueous solution of the sample. One such sample required 56.15 mL of 0.01301 M permanganate solution to completely titrate all the iron in the sample by the reaction shown above. How much did the sample weigh, if it was in fact pure melanterite? Hint: Watch your units carefully at each step of the problem.

A) 1.015 g
B) 0.203 g
C) 0.555 g
D) 4.851 g
E) 0.407 g