To determine the composition of a mixture containing benzene, toluene, and xylene using gas chromatography GC , you will need to follow these steps:1. Prepare the sample: Take a representative sample of the mixture and dissolve it in a suitable solvent, such as hexane or methanol, to create a solution with a known concentration.2. Inject the sample: Inject a known volume of the prepared sample into the gas chromatograph. The sample will be vaporized and carried through the column by an inert carrier gas, such as helium or nitrogen.3. Separation: The mixture will be separated based on the different boiling points and affinities of the components benzene, toluene, and xylene to the stationary phase in the GC column. The components with lower boiling points and lower affinity to the stationary phase will elute come out of the column first, followed by those with higher boiling points and higher affinity.4. Detection: As the separated components elute from the column, they will pass through a detector, such as a flame ionization detector FID or mass spectrometer MS , which will generate a signal proportional to the concentration of each component.5. Data analysis: The resulting chromatogram will show peaks corresponding to each component in the mixture. By comparing the retention times and peak areas of the unknown mixture to those of known standards, you can identify and quantify the benzene, toluene, and xylene in the mixture.6. Calculate the composition: Once you have the peak areas for each component, you can calculate the percentage composition of the mixture. Divide the peak area of each component by the total peak area of all components and multiply by 100 to obtain the percentage composition.For example, if the peak areas are as follows:- Benzene: 1500- Toluene: 3000- Xylene: 5500Total peak area = 1500 + 3000 + 5500 = 10000Percentage composition:- Benzene: 1500/10000 * 100 = 15%- Toluene: 3000/10000 * 100 = 30%- Xylene: 5500/10000 * 100 = 55%So, the composition of the mixture is 15% benzene, 30% toluene, and 55% xylene.