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+//Chapter-4,Example 9,Page 95
+clc;
+close;
+
+delta_H2= 2386   //enthalpy for.. yellow P---> H3PO4
+
+delta_H3= 2113   //enthalpy for.. red P---> H3PO4
+
+delta_HT = delta_H2- delta_H3   //enthalpy for...yellow P ---> red P
+
+// According to Hess's Law... delta_H1 = delta_H2 - delta_H3
+
+delta_HT = delta_H2 - delta_H3   // delta_H1 = delta_HT
+
+printf('the enthalpy change of transition from yellow P to red P is %.f cals',delta_HT)