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diff --git a/2465/CH5/EX5.11/Example_11.sce b/2465/CH5/EX5.11/Example_11.sce
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+//Chapter-5,Example 11,Page 126
+clc();
+close();
+
+a=0.1  //initial concentration of reactants
+
+x=0.2*a
+
+t=40   //time 
+
+k=x/(a*t*(a-x))
+
+t_half=1/(a*k)
+
+x1=0.75*a
+
+t1=x1/(k*a*(a-x1))
+
+printf('the rate constant is k = %.4f l/mol.min',k)
+
+printf('\n the half life period is %.f mins',t_half)
+
+printf('\n the time required to complete 75 percent reaction is %.f mins',t1)