4. From a tablet containing copper multivitamin preparation weighing 0.10 g, all copper was isolated in the form of copper (II) dithizonate, which was almost completely extracted with 50 ml of carbon tetrachloride. The absorbance of the extract at 545 nm in a 2 cm cuvette is 0.263. The molar absorption coefficient of copper(II) dithizonate under the indicated conditions is 4.52*104 dm3 mol-1-cm-1. What is the mass fraction of copper in the preparation?
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