11. When determining manganese in bronze to construct a calibration graph, the following results were obtained: the mass fraction w-1.77% corresponded to ΔS=0, the mass fraction wMn=0.83% corresponded to ΔS1=-0.54. Construct a calibration graph and determine the mass fraction (%) of manganese in the sample under study, if ΔSx = -0.33.

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