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+// Example 12_7
+clc;funcprot(0);
+// Given data
+T_o=25;// °C
+P=1;// atm
+T_1=600;// K
+T_2=1000;// K
+// The combustion equation C_8H_18(l)+12.5(O_2+3.76N_2)--->8CO_2+9H_2O(l)+47N_2
+N_CO2=8;// mol
+N_H2O=9;// mol
+N_N2=47;// mol
+N_O2=12.5;// mol
+hbar0_fO=-249910;// kJ/kmol (C_8H18)
+hbar0_fCO2=-393520;// kJ/kmol
+hbar_CO2=42770;// kJ/kmol
+hbar0_CO2=9360;// kJ/kmol
+hbar0_fH2O=-241810;// kJ/kmol
+hbar_H2O=35880;// kJ/kmol
+hbar0_H2O=9900;// kJ/kmol
+hbar0_fN2=0;// kJ/kmol
+hbar_N2=30130;// kJ/kmol 
+hbar0_N2=8670;// kJ/kmol
+hbar0_fO2=0;// kJ/kmol
+hbar_O2=17930;// kJ/kmol
+hbar0_O2=8680;// kJ/kmol
+M_CO2=44;// The molecular weight of carbon dioxide in kg/kmol
+M_H2O=18;// The molecular weight of H2O in kg/kmol
+M_N2=28;// The molecular weight of nitrogen in kg/kmol
+
+// Calculation
+H_P=(N_CO2*(hbar0_fCO2+hbar_CO2-hbar0_CO2))+(N_H2O*(hbar0_fH2O+hbar_H2O-hbar0_H2O))+(N_N2*(hbar0_fN2+hbar_N2-hbar0_N2));// The enthalpy of the products of combustion in kJ/kmol fuel
+// From table F_2 andF_3   
+hbar_N2=17560;// kJ/kmol (at 600 K for reactants)
+H_R=(hbar0_fO)+(N_O2*(hbar0_fO2+hbar_O2-hbar0_O2))+(N_N2*(hbar0_fN2+hbar_N2-hbar0_N2));// The enthalpy of the reactants of combustion in kJ/kmol fuel
+M_P=(N_CO2*M_CO2)+(N_H2O*M_H2O)+(N_N2*M_N2);// The mass of the products in kg/kmol fuel
+V=sqrt((2/M_P)*(H_R-H_P));// The exit velocity in m/s
+printf("\nThe exit velocity,V=%2.0f m/s",V);
+// The answer provided in the textbook is wrong