2. Solving a chemistry problem

5. An excess of KSCN was added to a 25.0 ml aliquot of a solution containing 3.8 μg/ml iron(III) and diluted to a final volume of 50.0 ml. What is the optical density of the resulting solution, measured at 580 nm in a cuvette with a thickness of 2.50 cm. The molar absorption coefficient of the FeSCN2 complex is 7000 l*cm-1*mol-1.