20. Solving a chemistry problem
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1. The optical density of the analyzed solution of riboflavin with a cuvette thickness of 1 cm is 0.275. After adding 0.50 ml of a standard solution of riboflavin with a concentration of 2.65*10-4 mol/l to 5.0 ml of this solution, the value of A increased to 0.370. Calculate the concentration and mass of riboflavin in 250 ml of the analyzed solution.
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