The content of H2S in water was determined by electrogenerated iodine according to the reaction: H2S I2 → STB 2Н 2I- . 3.0 g of KI was added to a 25.0 ml water sample and a current of 66.4 mA was passed for 7.25 min. Calculate the concentration of H2S (mg/l) in the sample.

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