6. When determining silicon in an aluminum alloy to build a calibration graph, the following results were obtained: the mass fraction of silicon ωSi = 1.70% corresponded to ΔS = 0, the mass fraction ωSi = 0.72% corresponded to ΔS1= - 0.48. Construct a calibration graph and determine the mass fraction (%) of silicon in the sample under study, if ΔSх = – 0.26.

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