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diff --git a/3856/CH12/EX12.3/Ex12_3.sce b/3856/CH12/EX12.3/Ex12_3.sce
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+//Estimate the Rate constant for a diffusion controlled reaction in water
+
+//Example 12.3
+
+clc;
+
+clear;
+
+R=8.314;  //Gas constant in J K^-1 mol^-1
+
+T=298;  //Absolute temperature in K
+
+eta=8.9*10^-4;  //Viscosity of water in J s m^-3 (1J=1N m therefore N s m^-2=J s m^-3 )
+
+KD=(8*R*T)*1000/(3*eta);  //Rate constant for diffusion controlled reaction in M^-1 s^-1(1 m^3 mol^-1 s^-1=1000 M^-1 s^-1)
+
+printf("Rate constant for diffusion controlled reaction = %.1f*10^9 M^-1 s^-1",KD*10^-9);
diff --git a/3856/CH12/EX12.3/Ex12_3.txt b/3856/CH12/EX12.3/Ex12_3.txt
new file mode 100644
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+++ b/3856/CH12/EX12.3/Ex12_3.txt
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+ Rate constant for diffusion controlled reaction = 7.4*10^9 M^-1 s^-1
+\ No newline at end of file