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A GC analysis of a oil containing the unknown diene produced a chromatogram with 3 distinct peaks. From the determination of peak area, you find that the percent compositions represented by the peaks are: peak A is 26.66 percent, peak B is 60 percent, and peak C is 13.33 percent. If the largest peak in the chromatogram corresponds to the diene, how many moles of diene are in the crude oil

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Answer:

0.011 moles of diene are in the crude oil

Explanation:

The mass of the oil is 2.5g and the M.W. of the diene is 136g/mol

The largest peak is the peak that has the higher percent concentration: That is the peak B with 60% by mass.

Knowing this we can find the mass of the diene using its percentage and with the mass and the molecular weight we can find its moles:

Mass Diene:

2.5g Oil * (60g Diene / 100g Oil) = 1.5g Diene are in the oil

Moles:

1.5g Diene * (1mol / 136g) =

0.011 moles of diene are in the crude oil

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