7. After appropriate processing of four standard samples of steel containing chromium, their polarograms were taken and the following results were obtained:

Samples 1 2 3 4
CC, % 0.3 0.42 0.96 1.40

h, mm 8.0 10.0 20.0 28.0

Calculate the percentage of chromium in the analyzed sample, if the wave height turned out to be hx during its polarography:
Options Wave height,
hx, mm
2 12.0

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