Calculate the mass fraction of copper in the ore according to the following data: from 0.1200 g of copper ore, after a series of operations, copper is transferred in solution in the form of Cu2. When potassium iodide is added to this solution, iodine is released, which was titrated with 13.80 ml of sodium thiosulfate solution with a copper titer of 0.006500 g/ml.
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