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AIR/FUEL RATIO BY MASS

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ETHYL ALCOHOL HAS THE CHEMICAL FORMULA C2H6O. CALCULATE THE STOICHIOMETRIC AIR/FUEL RATIO BY MASS AND THE CORRESPONDING WET GRAVIMETRIC ANALYSIS OF THE PRODUCTS OF COMBUSTION.

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ETHYL ALCOHOL HAS THE CHEMICAL FORMULA C2H6O. CALCULATE THE STOICHIOMETRIC AIR/FUEL RATIO BY MASS AND THE CORRESPONDING WET GRAVIMETRIC ANALYSIS OF THE PRODUCTS OF COMBUSTION.

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Problem.

Ethyl alcohol has the chemical formula C2H6O. Calculate the stoichiometric air/fuel ratio by mass and the corresponding wet gravimetric analysis of the products of combustion.

Solution:

a) Finding the A/F ratio

We will use following notations:

Mx = molar mass (kg/kmol)
 = volumetric ratio nitrogen/oxygen in the air composition
Mf = molar mass of the fuel (kg/kmol)

We consider the stoichiometric burning reaction of ethyl alcohol:
( 1)
The above coefficients will be found by simple atomic balance analysis:
- for carbon:  = 2
- for ...

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