100. Solving a chemistry problem

5. The molar absorption coefficient of the complex of indium with pyrocatechol violet is 35900 at λ= 630 nm. Determine the content of indium in the solution (g/l), if the relative optical density of the test solution, measured in a cuvette with an optical layer thickness of 1 cm, relative to the reference solution , containing 6 * 10-6 g-ion / l, turned out to be equal to 0.45