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Crude oil containing 5% by mass of light gases, 40% by mass of isooctane (C8H18), 45% by mass of cetane (C16H34) and 10% by mass

Crude oil containing 5% by mass of light gases, 40% by mass of isooctane (C8H18), 45% by mass of cetane (C16H34) and 10% by mass of asphaltenes (C38H16) enters a distillation column at a rate of 1 x 104kg/hr. If the bottoms consist entirely of asphaltenes, what percentage by mass of each substance is obtained in the overheads?

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