145. Solving a chemistry problem

33. A weighed steel weighing 1,200 g was dissolved in acid and diluted solution in dist. water up to the mark 50,00 ml. From the 5 ml of this solution, after appropriate treatment, 100.00 ml of the colored solution was obtained. The optical density of this solution was found to be 0.120. The following volumes were selected from a standard solution containing 0.1124 g of H2MoO4 * 2H2O in 100 ml of solution and the following optical densities were obtained after treatment with phenylhydrazine and dilution to 100.00 ml:
Selected volumes, Y, ml, 2.0 4.0 6.0 8.0 10.0
Opt density, A 0,050 0,110 0,160 0,210 0,250
Calculate the mass fraction of molybdenum (%) in steel.