21. In the gas chromatographic analysis of the purified product for the content of toluene, tert-butylbenzene was used as an internal standard. Initially, a standard mixture containing 0.050% (wt) of toluene and tert-butylbenzene was analyzed and chromatographic peaks were obtained with a height of 4.7 and 4.20 cm, respectively. When analyzing the product, 0.045% (wt.) of the standard was introduced and a chromatogram was obtained in which the peak heights of toluene and tert-butylbenzene were 5.52 and 4.11, respectively. What is the mass fraction (%) of toluene in the sample.
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