The graph below shows the absorption spectrum of a cream which is a possible candidate for a sunscreen. The thickness of the sunscreen layer is 1 mm and the concentration of the light absorbing chemical compound is 2 x 10-5 mol dm3 1.0 absorbance 0.5 . 200 300 400 500 wavelength / nm 600 700 (i) Calculate the molar absorptivity e of the chemical at 300 nm. (ii) What concentration of the chemical would have to be used in the cream in order for a thickness of 0.1 mm to absorb 99% of the UV-light at a wavelength of 300 nm? (i) Using the spectral data above, comment on the suitability of this cream as a sunscreen