A 100-mL sulfide-containing water sample was titrated with 12.15 mL of 0.041 M AgNO3 to determine its S2- content. The titration resulted to the formation of Ag2S precipitate. Calculate the concentration of sulfides in ppm H₂S. (MW (g/mol): AgNO3=169.9; S=32.1; Ag2S=247.8; H₂S-34.1) Express your answer with 2 decimal places and do not encode the units.

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