http://en.wikipedia.org/wiki/Molar_absorptivity
Absorbance = epsilon x length of cell x concn in mols/liter.
In your own words, describe how you would calculate the concentration of green pigment. Assume that your 1/100 solution had an Absorbance of 0.8 and that the extinction coefficient for the green pigment is = 20 mM-1cm-1. Remember the Beer Lambert Law!
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