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+clear ;
+clc;
+// Example 25.1
+printf('Example 25.1\n\n');
+//page no. 766
+// Solution Fig. E25.1
+
+// Given 
+// C(s) + O2(g) -->  CO2(g)                                  (A)
+// CO(g) + (1/2)(O2)(g) -->  CO2 (g)                    (B)
+Qa = -393.51 ;// Heat of reaction of reaction (a) - [kJ/g mol C] 
+Qb = -282.99 ;// Heat of reaction of reaction (b) - [kJ/g mol CO] 
+del_Ha = Qa ;// Change in enthalpy of reaction A - [kJ/g mol C]
+del_Hb = Qb ;// Change in enthalpy of reaction B - [kJ/g mol CO]
+
+// According to Hess's Law , subtract reaction (B) from reaction (A) , subtract corresponding del_H's to get enthalpy of formation of reaction (C)-    C(s) + (1/2)*O2 --> CO(g) , therefore 
+del_Hfc = del_Ha - del_Hb ;// Standard heat of formation of CO - [kJ/g mol C]
+printf('Standard heat of formation of CO is %.2f kJ/g mol C.',del_Hfc) ;
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