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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)