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diff --git a/3689/CH19/EX19.6/19_6.sce b/3689/CH19/EX19.6/19_6.sce
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+////Variable Declarations
+mr = 2.5e-3        //Moles reacted, mol
+P = 100.0          //Irradiation Power, J/s
+t = 27             //Time of irradiation, s
+h = 6.626e-34      //Planks constant, Js
+c = 3.0e8          //Speed of light, m/s
+labda = 280e-9     //Wavelength of light, m
+
+//Calculation
+Eabs = P*t
+Eph = h*c/labda
+nph = Eabs/Eph     //moles of photone
+phi = mr/6.31e-3
+
+//Results
+printf("\n Total photon energy absorbed by sample %3.1e J",Eabs)
+
+printf("\n Photon energy absorbed at 280 nm is %3.1e J",Eph)
+
+printf("\n Total number of photon absorbed by sample %3.1e photones",nph)
+
+printf("\n Overall quantum yield %4.2f",phi)
+