10. To plot a calibration graph, polarograms of four standard Cu (II) solutions were recorded and the wave height h was measured
с(Cu)•10-3, g/ml 0.50 1.00 1.50 2.00
h, mm 9.0 17.5 26.2 35.0
A sample of brass weighing 0.0795 (g) was dissolved and the solution was diluted to 50.0 ml. The height of the polarographic wave in the resulting solution was equal to hх=13.0 Calculate the mass fraction of copper in the analyzed samples

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