U2_M1_HW-key

# U2_M1_HW-key - Biodiesel Fuels-KEY Biodiesel fuels are popular alternatives to traditional gasoline fuels as the burn cleaner and produce much less

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Biodiesel Fuels-KEY Biodiesel fuels are popular alternatives to traditional gasoline fuels as the burn cleaner and produce much less engine residue (keeps your engine cleaner). A common biodiesel fuel is composed of linoleic acid methyl ester, C 19 H 34 O 2 . It has a density of about 0.88 g/mL. 1) Imagine you are using a biodiesel that is 100% linoleic acid methyl ester. Calculate the AF ratio for the combustion of this fuel and compare that to that of octane (C 8 H 18 ). Assume the products of the combustion are CO 2 and H 2 O. 2C 19 H 34 O 2 + 53O 2 38CO 2 + 34H 2 O 1.000 g of C 19 H 34 O 2 requires 2.879 g of O 2 , which equates to 9.836 g of air. This makes the AF ratio is 12.4:1. This is smaller than octane which is we calculated in class. 2) Construct a microscopic representation for the complete combustion of this biodiesel fuel (your reaction mixture should represent the reactants in their stoichiometric proportions). 3) Construct an AF graph like the ones we discussed in class. Depict the variations in the concentrations of CO 2 , H 2 O, O 2 , and C 19 H 34 O 2 as the AF increases. Stoichiometric Ratio AF C o n c e n t r a t i o n 9.8 RICH Fuel excess; O 2 limiting LEAN O 2 excess; Fuel O CO C 19 H 34 O 2

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4) If you drive 200 miles in your new soybean powered tour bus and consume 15 gallons of this biodiesel, calculate the amount of CO 2 produced (in kilograms). Again, assume the only products are CO 2 and water. Compare your result with the amount of CO 2 produced
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## This note was uploaded on 04/09/2009 for the course CHEM 151 taught by Professor Staff during the Fall '08 term at University of Arizona- Tucson.

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U2_M1_HW-key - Biodiesel Fuels-KEY Biodiesel fuels are popular alternatives to traditional gasoline fuels as the burn cleaner and produce much less

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