38. Solving a chemistry problem

102. During polarography of a 0.0010 M solution of Tl (I), the limiting diffusion current, measured using a capillary with a dripping period of 2.4 s and a flow rate of 2.7 mg / s, turned out to be 5.7 μA. For a solution of Tl (I) of unknown concentration against the same background, a limiting current of 20.5 μA was obtained for a new capillary with a dripping period of 3.7 s, and the mass of 100 drops was 0.9754 g. Calculate the unknown concentration of thallium.