145. Solving a chemistry problem

23. The molar absorption coefficient of the [MoO (SCN) 5] 2- complex in isoamyl alcohol at λeff = 475 nm is 1.50 * 10 ^ 4. Calculate the minimum mass fraction (%) of molybdenum in the soil, which can be determined by this method, if you extract molybdenum from 200.0 ml of oxalate buffer solution from a sample of a mass of 20.00 g. 150.0 ml of filtrate are taken out and, after appropriate treatment, the resulting [MoO (SCN) 5] 2-15.00 ml of isoamyl alcohol is extracted. The photometry extract in a cuvette with l = 3.0 cm. The minimum optical density is taken 0,020.