46. Solving a chemistry problem

358. When analyzing a mixture containing pyrrole with an unknown mass mx, 10 mg of an internal standard, hexylamine, was added to it. Five model solutions were prepared with a given ratio of the mass mst of the internal standard and the mass m of pyrrole, and these samples were chromatographed. We measured the ratio of the areas of their peaks on the Sst/S chromatograms and obtained the following results:

Sst /S 0.224 0.300 0.342 0.388 0.419
mst/m 0.172 0.232 0.262 0.301 0.326

Then the analyzed sample was chromatographed and found Sst/Sx=0.285. Based on the data obtained, build a calibration graph in the coordinates Sst/S - mst/m, find the ratio mst/mx from the graph and calculate the mass mx of pyrrole.