10. To plot a calibration graph, polarograms of four standard copper (II) solutions were recorded and the wave height hx mm was measured:
Ссu*103, g/ml 0.50 1.00 1.50 2.00
hx, mm 9.0 17.5 26.2 35.0
A sample of brass weighing 0.0694 (g) g was dissolved and the solution was diluted to 50.00 ml. The wave height on the polarograms was equal to hx 11.0 Calculate the mass fraction (%) of copper in the analyzed samples.

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