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The chromatographic analysis of Sample A resulted in a peak at 8.95 minutes and a peak area of 24237396. When 10.0µL of Sample A was mixed with 5.00 µL of 20.0 ppm standard, chromatographic analysis of the resulting solution resulted in a peak with a retention time of 9.12 minutes and a peak area of 121220801. What is the concentration of analyte in the original sample?

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You wish to measure the concentration of methyl benzoate in a plant stream by gas chromatography. You prepare a sample of butyl benzoate to use as an internal standard. A preliminary run, shown at the right involved a solution containing 1.15 mg/mL of methyl benzoate (peak A) and 1.26 mg/mL of butyl benzoate (peak B). The area of peak A was determined to be 338 and of peak B to be 382 (measured in arbitrary units by the computer). To measure the sample, 1.00 mL of a standard sample of butyl benzoate containing 2.11 mg/mL was mixed with 1.00 mL of the plant stream material, and analysis of the mixture gave a peak area of 437 for peak A and 391 for peak B. What is the concentration of the methyl benzoate in the plant stream?

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