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137. Solving a chemistry problem

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Chromatographic analysis of hexane, benzene and cyclohexane established the peak areas of these compounds equal to 274, 112 and 328 mm2, respectively. Then were introduced standard mixtures with a concentration of substances of 1 mg / l. The peaks obtained had areas of 72, 74, and 66 mm2 for hexane, benzene, and cyclohexane, respectively. Calculate the percentage of components in the sample. Take benzene as a standard
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