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diff --git a/647/CH4/EX4.6/Example4_6.sce b/647/CH4/EX4.6/Example4_6.sce
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+clear;
+clc;
+
+// Example: 4.6
+// Page: 124
+
+printf("Example: 4.6 - Page: 124\n\n");
+
+// Solution
+
+//*****Data*****//
+// HC : Heat of Combustion
+HC_NH3 = -90.6;// [kcal]
+HC_H2 = -68.3;// [kcal]
+//*************//
+
+// Heat of combustion of NH3:
+// 2NH3 + 3O = N2 + 3H2O ............................ (A)
+// Heat of combustion of H2:
+// H2 + O = H2O ..................................... (B)
+// Multiplying (B) by 3 & substracting from (A), we get:
+// 2NH3 = N2 + 3H2 .................................. (C)
+// Hf : Heat of Formation
+Hf_NH3 = -(2*HC_NH3 - 3*HC_H2)/2;// [kcal]
+printf("Standard Heat of formation of NH3 is %.1f kcal",Hf_NH3);
+\ No newline at end of file