Question

Chemistry

A scientist wishes to measure the concentration of methyl benzoate in a plant stream by gas chromatography. He prepares a sample of butyl benzoate to use as an internal standard. The results of a preliminary run, which used a solution known to contain 1.49 mg/mL of butyl benzoate (peak B), are shown. The area of peak A is determined to be 311 and the area of peak B is determined to be 364 measured in arbitrary units by the computer.

To measure the sample, 1.00 mL of a standard sample of butyl benzoate containing 2.29 mg/mL is mixed with 1.00 mL of the plant stream material. Analysis of the mixture gave a peak area of 475 for peak A and 423 for peak B.

What is the concentration of methyl benzoate in the plant stream?


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