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diff --git a/3689/CH15/EX15.8/15_8.sce b/3689/CH15/EX15.8/15_8.sce
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+////
+//Variable Declaration
+M = 0.040             //Moleculat wt of Ar, kg/mol
+h = 6.626e-34         //Planks's Constant, J.s
+NA = 6.022e23         //Avagadro's Number, 1/mol
+k = 1.38e-23          //Boltzmann constant, J/K
+T = 298.15            //Std. state temeprature,K 
+P = 1e5               //Std. state pressure, Pa
+R = 8.314             //Ideal gas constant, J/(mol.K)
+n = 1.0               //Number of mole, mol
+
+//Calcualtions
+m = M/NA
+Labda3 = (h**2/(2*%pi*m*k*T))**(3./2)
+G0 = -n*R*T*log(k*T/(P*Labda3))
+
+//Results
+printf("\n Thermal wave lengths for Ne is %4.2e m3",Labda3)
+
+printf("\n The Gibbs energy for 1 mol of Ar is %6.2f kJ",G0/1000)
+