29. Solving a chemistry problem

2. When studying the attenuation of blue light by iron hydroxide sols, the following data were obtained:
Sol concentration, % (mass) 0.10 0.08 0.02
Layer thickness, mm 2.5 2.5 5.0
Fraction of transmitted light, % 5.9 10.9 32.5
Show the applicability of the Bouguer-Lambert-Beer equation for this disperse system. Calculate what fraction of light will be scattered by a 0.15% sol with an absorbing layer thickness of 20 mm.