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diff --git a/3689/CH4/EX4.3/4_3.sce b/3689/CH4/EX4.3/4_3.sce
new file mode 100644
index 000000000..d994c1c59
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+++ b/3689/CH4/EX4.3/4_3.sce
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+////Varialble Declaration
+ms1 = 0.972          //Mass of cyclohexane, g
+DT1 = 2.98           //Change in temperature for bath, °C
+DUR1 = -3913e3       //Std Internal energy change, J/mol
+mw = 1.812e3         //Mass of water, g
+ms2 = 0.857          //Mass of benzene, g
+Ms1 = 84.16
+Ms2 = 78.12
+DT2 = 2.36           //Change in temperature for bath, °C
+Mw = 18.02
+Cpw = 75.3 
+
+//Calculation
+
+Ccal = ((-ms1/Ms1)*DUR1-(mw/Mw)*Cpw*DT1)/DT1
+DUR2 = (-Ms2/ms2)*((mw/Mw)*Cpw*DT2+Ccal*DT2)
+
+//Results
+printf("\n Calorimeter constant %4.2e J/°C",Ccal)
+
+printf("\n Enthalpy of rection for benzene %4.2e J/mol",DUR2)
+