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diff --git a/389/CH2/EX2.5/Example2_5.sce b/389/CH2/EX2.5/Example2_5.sce
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+clear;
+clc;
+
+// Illustration 2.5
+// Page: 37
+
+printf('Illustration 2.5 - Page: 37\n\n');
+
+// solution
+
+//***Data****//
+// a = mannitol b = H2O
+T = 293; // [K]
+//*****//
+
+Mb = 18.02;// [kg/kmol]
+// From Table 2.3 (Pg 33)
+Va = (0.0148*6)+(0.0037*14)+(0.0074*6); // [cubic m/kmol]
+viscosity = 0.001005; // [kg/m.s]
+association_factor = 2.26; // [water as a solvent]
+Dab = (117.3*10^(-18))*((association_factor*Mb)^0.5)*T/(viscosity*Va^0.6); // [square m/s]
+printf('Diffusivity of mannitol is %e square m/s\n',Dab);
+printf('Observed value is 0.56*10^(-9) square m/s');
+\ No newline at end of file