Absorbance = 12,100 m-1 * [ferroin (m)] + 0.00230 and the measured absorbance of a sample solution is 0.367, what is the ferroin concentration in the measured solution? a.2.76 x 10-5 m b.3.01 x 10-5 m c.3.45 x 10-5 m d. none of the above