14. The reaction mass after nitration of toluene was analyzed by gas-liquid chromatography using ethylbenzene as an internal standard. Determine the mass fraction of unreacted toluene according to experimental data: a sample of the reaction mass is 15.26 g, ethylbenzene is added 1.09 g, the peak area of toluene is 108 mm2, the correction factor for toluene is 0.79, the peak area of ethylbenzene is 158 mm2, the correction factor is 0.82.

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