An iron ore sample weighing 0.9132 g is dissolved in HCl(aq), and the iron is obtained as Fe2+(aq). This solution is then titrated with 28.72 mL of 0.05051 M K2Cr2O7. What is the mass percent Fe in the ore sample. Fe2+ + Cr2O72- ➡️ Fe3+ + Cr3+

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