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+//computation of standard free energy change for a reaction
+
+clear;
+clc;
+
+printf("\t Example 19.5\n");
+
+n=6;
+F=96500;//faraday constant, J/V mol
+
+E0cathode=-2.87;//standard electrode potential of cathode(Ca2+/Ca), V
+E0anode=1.5;//standard electrode potential of anode(Au3+/Au), V
+
+E0cell=E0cathode-E0anode;//standard emf of the cell, V
+
+deltaG0=-n*F*E0cell;//standard free energy change for the reaction, kJ/mol
+
+printf("\t the standard free energy change for the reaction is : %4.2f*10^3 kJ/mol \n",deltaG0*10^-6);
+
+//End