3. A 50 ml (0.05 l) solution was prepared from a sample of hydroquinone preparation weighing 0.0500 g and its optical density Ax was measured. In parallel, the optical density of a standard (Ast) solution of hydroquinone with a concentration of 0.0003 g/ml was measured in the same cuvette. Calculate the content of hydroquinone in the preparation (in mg) and its mass fraction in the preparation if the found ratio of optical densities Ax/Ast=0.8960.

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