Ferrochrome is an alloy of iron and chromium. Ferrochrome can be dissolved in dilute sulfuric acid to produce a mixture of FeSO4 and Cr2(SO4)3. The FeSO4 reacts with K2Cr2O7 in acid solution according to the following equation. 14H+ + 6Fe2+ + Cr2O7 2– → 2Cr3+ + 6Fe3+ + 7H2O When 1.00g of ferrochrome is dissolved in dilute sulfuric acid, and the resulting solution titrated, 13.1cm3 of 0.100moldm–3 K2Cr2O7 is required for complete reaction. What is the percentage by mass of Fe in the sample of ferrochrome? A 1.22 B 4.39 C 12.2 D 43.9
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