57. To determine copper by the polarographic method, a sample of the alloy 0.5004 g was taken, which was transferred to a volumetric flask with a capacity of 50 cm3. For polarography, 20.00 cm3 of the obtained solution was taken; the height of the polarographic wave was 24 mm. When polarography of the same volume of a standard solution containing 0.8 mg of copper (ll), a polarographic wave 20 mm high was obtained. Calculate the percentage of copper in the alloy.

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