9. To determine the copper in the non-ferrous alloy, 25

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9. To determine the copper in the non-ferrous alloy, 250 cm3 of the colored solution was obtained from a sample weighing 0.3560 g after dissolving and treating with ammonia, the optical density of which in the cell l = 1.0 cm was 0.260. The molar absorption coefficient of copper ammine is 400. Determine the mass fraction (%) of copper in the alloy.