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diff --git a/599/CH2/EX2.23/example2_23.sce b/599/CH2/EX2.23/example2_23.sce
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+
+clear;
+clc;
+printf("\t Example 2.23\n");
+                //it is the case of equimolar conter diffusion as the tube is perfectly sealed to two bulbs at the end and the pressure throughout is constant
+d=0.001;
+area=3.14*(d/2)^2;     //area of the bulb
+T=298;                  //temperature in kelvin 
+p=1.013*10^5;          //total pressure of both the bulbs
+R=8314;               //universal gas constant
+c=p/(R*T);            //total concentration
+Dab=.784*10^-4;      //diffusion coefficient in m^2/s
+xa1=0.8;             //molefraction of nitrogen gas at the 1 end
+xa2=0.25;            //molefraction of nitrogen gas at the 2nd end
+z=.15;               //distance between the bulbs
+
+    //rate=area*Na;
+rate=area*Dab*c*(xa1-xa2)/z;    //rate of transfer of hydrogen and hydrogen
+printf("\n the rate of transfer from 1 to 2 of  nitrogen and 2 to 1of hydrogen is :%f *10^-11kmol/s",rate/10^-11);
+//end
+\ No newline at end of file