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diff --git a/2465/CH9/EX9.4/Example_4.sce b/2465/CH9/EX9.4/Example_4.sce
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+//Chapter-9,Example 4,Page 220
+clc();
+close();
+
+R= 550   //resistance of the cell
+
+K=0.002768    //specific conductivity
+
+C_constant= R*K
+
+p= 72.18    //observed resistance
+
+Kv = C_constant*(1/p)
+
+C= 0.2     //concentration
+
+lamda_v= Kv*1000/C  //equivalent conductivity
+
+M= 0.1
+
+lamda_m= 1000*Kv/M   //molar conductivity
+
+printf('the equivalent conductivity of ZnSO4 is %.2f /ohm.cm^2',lamda_v)
+
+printf('\n the molar conductivity of ZnSO4 is %.2f /ohm.cm^2',lamda_m)