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diff --git a/3689/CH18/EX18.9/18_9.sce b/3689/CH18/EX18.9/18_9.sce
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+////
+//Variable Declaration
+Ea = 42.e3      //Activation energy for reaction, J/mol
+A  = 1.e12      //Pre-exponential factor for reaction, 1/s
+T = 298.0       //Temeprature, K
+Kc = 1.0e4      //Equilibrium constant for reaction
+R = 8.314       //Ideal gas constant, J/(mol.K)
+//Calculations
+kB = A*exp(-Ea/(R*T))
+kA = kB*Kc
+kApp = kA + kB
+
+//Results
+printf("\n Forward Rate constant is %4.2e 1/s",kA)
+
+printf("\n Backward Rate constant is %4.2e 1/s",kB)
+
+printf("\n Apperent Rate constant is %4.2e 1/s",kApp)
+