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diff --git a/647/CH4/EX4.2/Example4_2.sce b/647/CH4/EX4.2/Example4_2.sce
new file mode 100755
index 000000000..f757a2a6f
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+++ b/647/CH4/EX4.2/Example4_2.sce
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+clear;
+clc;
+
+// Example: 4.2
+// Page: 119
+
+printf("Example: 4.2 - Page: 119\n\n");
+
+// Solution
+
+//*****Data*****//
+// Mg + (1/2)O2 = MgO ...............(1)
+deltaH1 = -610.01;// [kcal]
+// 2Fe + (3/2)O2 = Fe2O3 ............(2)
+deltaH2 = -810.14;// [kcal]
+//*************//
+
+// 3Mg + Fe2O3 = 3MgO + 2Fe .........(3)
+// Multiplying (1) by 3 and substracting from (2), we get (3):
+deltaH = 3*deltaH1 - deltaH2;// [kcal]
+printf("Heat produced in the reaction is %.1f kcal\n",deltaH);
+\ No newline at end of file