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+//Chapter-4,Example 7,Page 94
+clc;
+close;
+
+delta_H1= 104    //for reaction.. H2(g)---> 2H(g)
+
+delta_H2= 120/2    //for reaction.. (1/2)O2(g)---> O(g)
+
+delta_H3= -58    //for reaction.. H2(g) + (1/2)O2(g)---> H2O(g)
+
+delta_H=delta_H1 + delta_H2 - delta_H3
+
+//there are two O-H bonds 
+//therefore for one bond required heat energy is half of delta_H
+
+printf('the O-H bond energy is %.f Kcal',delta_H/2)