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diff --git a/647/CH4/EX4.11/Example4_11.sce b/647/CH4/EX4.11/Example4_11.sce
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+clear;
+clc;
+
+// Example: 4.11
+// Page: 130
+
+printf("Example: 4.11 - Page: 130\n\n");
+
+// Solution
+
+//*****Data*****//
+CO2 = 13.4;// [percent by volume]
+N2 = 80.5;// [percent by volume]
+O2 = 6.1;// [percent by volume]
+//*************//
+
+// Basis : 100 cubic m of flue gas.
+Vol_N2_flue = N2;// [Volume of Nitrogen in flue gas, cubic m]
+Vol_O2_flue = O2;// [Volume of O2 in flue gas, cubic m]
+Vol_Air = N2/0.79;// [Volume of air supplied, cubic m]
+Vol_O2 = Vol_Air*0.21;// [Volume of O2 in air supply, cubic m]
+Vol_O2_cumbustion = Vol_O2 - Vol_O2_flue;// [Volume of O2 used up in cumbustion of the fuel, cubic m]
+Excess_Air = Vol_O2_flue/Vol_O2_cumbustion * 100;// [percent of excess air supplied]
+printf("Percent of excess air supplied is %.1f %%",Excess_Air);
+\ No newline at end of file