5. (30 points) Consider a mixture of 90% octane (CsH18) and 10% ethanol (CH5OH, or CH6O)...

 

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5. (30 points) Consider a mixture of 90% octane (CsH18) and 10% ethanol (C₂H5OH, or C₂H6O) on a molar basis. This might be a first approximation for the composition of a gasoline/ethanol mixture. a. Write a global balanced reaction for the combustion of a stoichiometric mixture of this fuel blend with air, making our standard approximations.. b. Compute the mole fractions of octane and ethanol in the fuel/air reactant mixture. c. Compute the molecular weight of the fuel/air reactant mixture in kg/kmol. d. Compute the mass fractions of octane and ethanol in the fuel/air reactant mixture. 5. (30 points) Consider a mixture of 90% octane (CsH18) and 10% ethanol (C₂H5OH, or C₂H6O) on a molar basis. This might be a first approximation for the composition of a gasoline/ethanol mixture. a. Write a global balanced reaction for the combustion of a stoichiometric mixture of this fuel blend with air, making our standard approximations.. b. Compute the mole fractions of octane and ethanol in the fuel/air reactant mixture. c. Compute the molecular weight of the fuel/air reactant mixture in kg/kmol. d. Compute the mass fractions of octane and ethanol in the fuel/air reactant mixture.

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