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+//////Variable Declaration
+Dh = 7.6e-7 //Diffusion coefficient of Hemoglobin, cm2/s
+Do2 = 2.2e-5 //Diffusion coefficient of oxygen, cm2/s
+rh = 35. //Radius of Hemoglobin, °A
+ro2 = 2.0 //Radius of Oxygen, °A
+k = 4e7 //Rate constant for binding of O2 to Hemoglobin, 1/(M.s)
+NA =6.022e23 //Avagadro Number
+//Calculations
+DA = Dh + Do2
+kd = 4*%pi*NA*(rh+ro2)*1e-8*DA
+
+//Results
+printf("\n Estimated rate %4.1e 1/(M.s is far grater than experimental value of %4.1e 1/(M.s, \nhence the reaction is not diffusion controlled",kd,k)
+