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+clc;clear;
+//Example 15.1
+
+//given data
+nO2i=20;
+nC8H18i=1;//intial moles of air and octane
+
+//from Table A-1
+Mair=29;
+MC=12;
+MH=2;
+
+//calculations
+// Chemical Reaction
+// C8H18 + 20(O2+3.76N2)= xCO2 + yH2O + zO2 + wN2
+//by elemental balance of moles
+x=8;
+y=18/2;
+z=20*2-2*x-y;
+w=20*3.76;
+disp(x,'kmoles of CO2');
+disp(y,'kmoles of H2O');
+disp(z,'kmoles of O2');
+disp(w,'kmoles of N2');
+//thus equn becomes
+// C8H18 + 20(O2+3.76N2)= 8CO2 + 9H2O + 7.5O2 +75.2N2
+AF=nO2i*4.76*Mair/(x*MC + y*MH);
+disp(AF,'air-fuel ratio of combustion process in kg air/kg fuel')