Iron in blood serum can be measured by reducing it to Fe²⁺ and reacting it with ferrozine to form [Fe(ferrozine)₃]^4–, a purple complex that has a maximum absorbance at 562 nm.
The molar absorption coefficient, ε, for the complex at 562 nm is 2.79 * 10⁴ L · mol^–1 · cm^–1. A solution of the complex ion had an absorbance at 562 nm of 0.703 in a cuvette with path length 2.00 cm. Determine the molar concentration of [Fe(ferrozine)₃]^4– in the solution.