n-Octanc (C8H18) is burned completely with 75% excess air (assume air is 79% N2

Question

n-Octanc (C8H18) is burned completely with 75% excess air (assume air is 79% N2 and 21% O2). Find the number of moles of each product and reactant. Find the mass of each product and reactant. Using the masses from b), show that mass is conserved. Are mass-based and mole-based air-to-fuel ratios the same? Calculate both and prove your answer. The adiabatic flame temperature for the combustion of C8H18 with the stoichiometric amount of air is 2122 degree C. Estimate the adiabatic flame temperature for this case. Explain/justify your answer. Describe incomplete combustion (include both causes of and results of incomplete combustion). When driving my car in the winter, liquid is sometimes seen coming out of the tailpipe of the car in front of me. Explain this is and why it happens.

Explanation / Answer

a. The basic combustion reaction is

C8H18 + 12.5O2 = 8CO2 +   9H2O

1 mol      12.5 mol   8 mol       9mol

Add an excess of 37.5 mol O2 (not reacted)

Add the corresponding N2 amount;

21 mol O2

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