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diff --git a/2510/CH4/EX4.9/Ex4_9.sce b/2510/CH4/EX4.9/Ex4_9.sce
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+//Variable declaration:
+n = 600                     //The mass flow rate of fluid (lbmol/min)
+Cp_AV = 0.271               //Heat capacity (Btu/lbmol . °F)
+T1 = 200                    //Initial temperature(°F)
+T2 = 600                    //Final temperature(°F)
+
+//Calcultaion:
+Q = n*Cp_AV*(T2 - T1)       //The required heat rate (Btu/min)
+Q = Q - modulo(Q,1000)
+
+//Result:
+printf ("The required heat rate is : %.0f Btu/min",Q)