The reaction mass of 12.7500 g after nitration of toluene was analyzed by gas-liquid chromatography using ethylbenzene as an internal standard in the amount of 1.2500 g. Determine the mass fraction (%) of unreacted toluene using the following data:

Component Toluene Ethylbenzene
Peak area, mm2 307 352
Correction factor 1.01 1.02

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