3. A sample of 0.2600 g of technical CuCl was dissolved in an excess of hydrochloric acid solution NH4Fe(SO4)2. To titrate the formed Fe2, 20.18 cm3 of K2Cr2O7 with C(1/6 K2Cr2O7) = 0.1200 mol/dm3 was consumed. Find the percentage of CuCl in the sample.

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