1A. A 1.000g sample of steel is dissolved in acid and the manganese oxidized to permanganate. Water is added until the total volume of the solution is 250mL. The absorbance at 520nm is found to be 0.700. Claculate the percentage of manganese in the steel if the molar absorptivity of permanganate is 2235L/cm mol at this wavelength? The cell path length is 1.00cm.
B. A compound of molar mass 1.00E2 g/mol has a molar absorptivity of 3.0E5L/cm mol. How many grams of this compound should be dissolved in 1.00L so that in a 250 fold dilution the resulting solution will give an absorbance reading of 0.600? Assume the cell path to be 1.00cm.