Diesel is a mixture of hydrocarbons with between 8 and 21 carbon atoms. The aver

Question

Diesel is a mixture of hydrocarbons with between 8 and 21 carbon atoms. The average empirical formula for the misture that is diesel corresponds to Ci2H23- Biodiesel is a fatty acid ester that can be synthesized from the fatty acids (stearic acid or linoleic acid) in plants or from used cooking ol, such as canols oil or soybean oil. A typical component of blodesel has the formula CsoH3s02- (a) write and balance the combustion reaction for diesel (Cs2H23) and for biodiesel (CigHj602). (Hine: Recall how combustion engines work before answering this question Include states-of-matter under the given conditions in your answer. Lse the lowest possible whoe number cocfficients.) Diesel Help Diodiesel (b) Calculate the kg of carbon duxide emitied per kg of asve and bieesel ne unrounded vaes.) ) Diesei kg COz/ kg diese

Explanation / Answer

Ans

a) The combustion reaction of diesel is given as :

4C12H23 (l) + 71O2 (g) ---> 48CO2 (g) + 46H2O (g)

The combustion reaction of biodiesel is given as :

C19H36O2 (l) + 27O2 (g) = 19CO2 (g) + 18H2O (g)

Ans b)

i)

1 kg of diesel = 1000 / 167.3 = 5.98 moles

5.98 moles of diesel will make 71.7 moles of CO2

So the amount of CO2 = 71.7 x 44.01 = 3.156 kg

= 3.156 kg CO2/ kg diesel.

ii)

1 kg of biodiesel = 1000 / 296.49 = 3.37 moles

3.37 moles of biodiesel will make 64.1 moles of CO2

So the amount of CO2 = 64.1 x 44.01 = 2.82 kg

= 2.82 kg CO2 / kg biodiesel

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