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n-Octane is burned with stoichiometric amount of oxygen. The mass fractions of each of the products...

n-Octane is burned with stoichiometric amount of oxygen. The mass fractions of each of the products and the mass of water in the products per unit mass of fuel burned are to be determined.

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Answer #1

Assumption 1: Combustion is complete.

Assumption 2 : The combustion products contain CO2 and H2O.

Assumption 3 : Combustion gases are ideal gases.

The molar masses of C, H2, and O2 are 12 kg/kmol, 2 kg/kmol, and 32 kg/kmol, respectively.

The combustion equation in this case is;

C8H18 +12.5O2 ⎯⎯→8CO2 + 9H2O

The mass of each product and the total mass are,

Then the mass fractions are

The mass of water in the products per unit mass of fuel burned is determined from

molecular weight of octane is 114gm/mole

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