5. To construct a calibration graph, polarograms of four standard solutions of copper (II) salt 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 weighed portion of brass weighing 0.1200 g was dissolved and the solution was diluted to 50.00 ml.
Calculate the mass fraction of copper in the analyzed samples if the wave height did not turn out to be equal to 23.00 mm

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