37. Solving a chemistry problem

100. After appropriate processing of a sample of biological material weighing m (g), 20.0 ml of an alkaline solution containing bilirubin (M (C33H36O6N4) = 584.67 g / mol) was obtained. The diffusion current of cathodic reduction of bilirubin Id1 was measured. 5.0 ml of a standard solution of bilirubin with a concentration of 5.00 • 10–4 mol/l was added to the electrolyzer and Id2 was measured under the same conditions. Calculate the concentration (in milligrams per gram) of bilirubin in biological samples:
No. of the task Mass of sample m, g Diffusion current
Id1 Id2
100 15.0 0.35 0.88