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+//computation of standard free energy change for a reaction
+
+clear;
+clc;
+
+printf("\t Example 19.6\n");
+
+n=2;
+F=96500;//faraday constant, J/V mol
+
+Co2=0.15;//conc of Co2+ ions, M
+Fe2=0.68;//conc of Fe2+ ions, M
+
+E0cathode=-0.44;//standard electrode potential of cathode(Fe2+/Fe), V
+E0anode=-0.28;//standard electrode potential of anode(Co2+/Co), V
+
+E0cell=E0cathode-E0anode;//standard emf of the cell, V
+
+Ecell=E0cell-0.0257/2*log(Co2/Fe2);//calculation of cell potential at non standard conditions, V
+
+if(Ecell>0) then
+    printf("\t the reaction would proceed spontaneously in the direction written \n");
+else
+    printf("\t the reaction is not spontaneously in the direction written \n");
+    end;
+
+//End