A 0.500g illustration is analyzed spectrophotometrically coercion manganese by dissolving it in aculeated and transferring to a 250 mL flask and diluting to dimensions. Three aliquots ae analyzed by transferring 50 mL portions with a pipet to 500 mL Erlenmeyer flask and reacting with an oxidizing principal, potassium peroxydisulfate, to apply the manganese to permanganate. After reaction, these are quantitatively transferred to 250 mL dimensionstric flasks, ductile to dimensions and measured spectrophotometrically.
By similitude with standards, the mediocre energy of the ultimate rejoinder is attached to be 1.25 x 10^-5M. What is the percent manganese in the illustration?