91. Solving a chemistry problem

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4. Polarography of 10.0 ml of nicotinamide solution resulted in a wave with a height of 38 mm. After adding 1.50 ml of a standard solution containing 2.00 mg/ml of nicotinamide to this solution, the wave increased to 80.5 mm. Calculate the content of the drug (mg/ml) in the analyzed solution.

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