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A solution containing 6.3 X a0^-8 M benzene and 2.0 X 10^-7 M cyclohexane gave peal areas of 3950 and 4870, respectively, in a GC experiment. An unknown benzene sample was treated with 1.6 X 10^-5 M cyclohexane. A GC analysis gave these peal areas: 5200 and 8900 for benzene and cyclohexane, respectively. Find the concentration of benzene in the unknown sample.

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