3. A sample of steel with a mass of m (g) was dissolved in a 50.0 ml flask. Aliquots of 20.0 ml were taken into two 50.0 ml measuring flasks. A solution containing 1.000 mg of titanium was added to one flask. Then a solution of hydrogen peroxide was placed in both flasks and the solutions were brought to the mark with water.
Calculate the mass fraction of titanium in steel if the following optical densities Ax and Ax st were obtained during photometry of the solutions:
Option m, g Ax Ax st
3 0.5000 0.220 0.440

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