a mixture containing 80.0 nM iodoacetone (Designated A) and 64.0 nM p-dichlorobenzene (Designated B) gave the relative detector response (Peak area of A) / (Peak area of B) = 0.71 in a chromatography expiriment. A solution containing an unknown quantity of A plus 930 nM B gave a relative response = 1.21
Find the concentration of A in the unkown.
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