4. When determining ethyl alcohol in 15.2600 g of the mixture by gas-liquid chromatography, normal butyl alcohol in the amount of 1.0900 g was used as an internal standard. Determine the mass fraction of ethyl alcohol using the following data:
Ethyl alcohol peak n-butyl alcohol peak
Height Half-width Height Half-width
35 mm 3 mm 52 mm 2 mm

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