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+clc

+clear

+//Input data

+T=800;//The given temperature in K

+e=1;//The equivalence ratio 

+

+//Calculations

+hi=154.723;//Sensible Enthalpy for isooctane at 800 K in MJ/kmol 

+ho=15.841;//Sensible Enthalpy for oxygen at 800 K in MJ/kmol 

+hn=15.046;//Sensible Enthalpy for nitrogen at 800 K in MJ/kmol

+nc=0.00058;//Number of kmoles of C8H18 for equivalence ratio for 1 kg of air 

+no=0.00725;//Number of kmoles of oxygen for equivalence ratio for 1 kg of air 

+nn=0.0273;//Number of kmoles of nitrogen for equivalence ratio for 1 kg of air 

+Hs=(nc*hi)+(no*ho)+(nn*hn);//Total sensible enthalpy of reactants in MJ per kg of air

+Hs1=Hs*1000;//Total sensible enthalpy of reactants in kJ per kg of air 

+R=8.314;//Gas constant in kJ/kgK

+n=nc+no+nn;//Total number of kmoles for 1 kg of air

+Us=Hs-(n*R*10^-3*(T-298));//sensible internal energy of reactants in MJ per kg of air 

+Us1=Us*1000;//sensible internal energy of reactants in kJ per kg of air

+

+//Output

+printf('Total sensible enthalpy of reactants = %3.1f kJ/kg air \n Sensible internal energy of reactants = %3.1f kJ/kg air ',Hs1,Us1)