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clc
clear
//Input data
CO2=11.5;//Percentage of carbondioxide present in combustion in %
O2=2.7;//Percentage of oxygen present in the combustion in %
CO=0.7;//Percentage of carbonmonoxide present in the combuston in %
//Calculations
a=85.1/3.76;//Equating moles for nitrogen from the equation
x=(CO2+CO)/3;//Equating moles for carbon from the equation
b=[a-CO2-(CO/2)-O2]*2;//Equating moles for oxygen from the equation
y=a/x;//Moles of oxygen supplied for one mole of propane gas
z=5;//Theoretically 5 moles of oxygen are required for reacting
E=[(y-z)/z]*100;//The excess of air supplied in %
//Output
printf('The percentage excess air used is = %3.1f percentage',E)
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