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//Chapter-4,Example 8,Page 94
clc;
close;
delta_H_C= -393 // enthalpy for carbon
delta_H_H2= -286 //enthalpy for hydrogen
delta_H_C3H8=-2220 //enthalpy for propane
// According to Hess's Law... delta_H1 = delta_H2 - delta_H3
//delta_H2 for reaction... 3C +4H2 +5O2 ----> 3CO2 +4H2O
delta_H2= 3*delta_H_C +4*delta_H_H2
//delta_H2 for reaction... C3H8 + 5O2 ----> 3CO2 +4H2O
delta_H3= delta_H_C3H8
delta_Hf= delta_H2 - delta_H3 //enthalpy for propane at 298 K
printf('the enthalpy of formation of propane at 298K is %.f Kcal', delta_Hf)
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