The amount of iron in ore was determined using dichrometry wherein dichromate (Cr₂O₇^2–) is used to oxidize Fe²⁺ to Fe³⁺. The net ionic equation is as follows:

Cr₂O₇^2–(aq) + 6 Fe²⁺(aq) + 14 H⁺(aq) → 6 Fe³⁺(aq) + 2 Cr³⁺(aq) + 7 H₂O(l)

Calculate the mass percent of iron in a 0.2485 g sample of ore given that 21.41 mL of 0.0167 M Cr₂O₇^2– was used to titrate all of the Fe²⁺.