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+clc;clear;
+//Example 15.8
+//this invovles EES hence the below code explains a approach with approximation
+
+//calculations
+
+//part - a
+//C8H18 + 12.5 (O2 + 3.76N2) = 8CO+ 9H2O + 47N2
+//from std. values of heat of formation and ideal gasses in Appendix
+//octane as oc
+hfoc=-249950;
+//oxygen as o
+hfo=0;
+h298o=8682;
+//nitrogen as n
+hfn=0;
+h298n=8669;
+//water as w
+hfw=-241820;
+h298w=9904;
+//carbondioxide as c
+hfc=-393520;
+h298c=9364;
+//x refers to 8hCO2 + 9hH20 + 47hN2
+xac=1*(hfoc)+8*(h298c-hfc)+9*(h298w-hfw)+47*(h298n-hfn);
+//from EES the Tprod is determined by trial and error
+//at 2400K
+x2400=5660828;
+//at 2350K
+x2350=5526654;
+//the actual value of x is xac and T can be determined by interpolation
+Tprod=(xac-x2350)*(2400-2350)/(x2400-x2350)+2350;
+Tprod=ceil(Tprod);
+disp(Tprod,'adiabatic flame temperature for complete combustion with 100 percent theoretical air,in K');
+
+//part - b
+//C8H18 + 50 (O2 + 3.76N2) = 8CO+ 9H2O + 37.5O2 + 188N2
+//solved similarly using EES and approximation and interpolation
+//similarly we can solve the part - c 
+//the above concept is applied