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diff --git a/172/CH15/EX15.15/ex15.sce b/172/CH15/EX15.15/ex15.sce
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+//ques15
+//calculatng reversible elecromotive force 
+clear
+clc
+//1-H2O
+//2-H2
+//3-O2
+//hf-standard enthalpy 
+//sf-standard entropy
+hf1=-285.830;//kJ
+hf2=0;//kJ
+hf3=0;//kJ
+sf1=69.950;//kJ/K
+sf2=130.678;//kJ/K
+sf3=205.148;//kJ/K
+dH=2*hf1-2*hf2-hf3;//change in enthalpy in kJ
+dS=2*sf1-2*sf2-sf3;//change in entropy in kJ/K
+T=298.15;//temperature in K
+dG=dH-T*dS/1000;//change in gibbs free energy in kJ
+E=-dG*1000/(96485*4);//emf in V
+printf('Reversible electromotive Force = %.3f V',E);
+\ No newline at end of file