7. A sample of steel, mass m (g) was dissolved in a flask with a capacity of 50.0 ml. Aliquots of 20.0 ml each were taken into two 50.0 ml volumetric flasks. A solution containing 1,000 mg of titanium was added to one flask. Next, 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 solutions:
Option m, g Ah Ah st
7 0.6675 0278 0.472

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