Suppose a student is given 5.375 g of a powdered mixture to separate. Because the mixture contains iron shavings, the student decides to separate them using a magnet and obtains 1.824 g of iron. What is the mass percent of iron in the mixture

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.