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diff --git a/647/CH4/EX4.5/Example4_5.sce b/647/CH4/EX4.5/Example4_5.sce
new file mode 100755
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+++ b/647/CH4/EX4.5/Example4_5.sce
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+clear;
+clc;
+
+// Example: 4.5
+// Page: 122
+
+printf("Example: 4.5 - Page: 122\n\n");
+
+// Solution
+
+//*****Data*****//
+// Zn + S = ZnS ....................................................(A)
+deltaH_A = -44;// [kcal/kmol]
+// ZnS + 3O2 = 2ZnO + 2SO2 .........................................(B)
+deltaH_B = -221.88;// [kcal/kmol]
+// 2SO2 + O2 = 2SO3 ................................................(C)
+deltaH_C = -46.88;// [kcal/kmol]
+// ZnO + SO3 = ZnSO4 ...............................................(D)
+deltaH_D = -55.10;// [kcal/kmol]
+//***************//
+
+// Multiplying (A) by 2 & (D) by (2) and adding (A), (B), (C) & (D)
+// Zn + S + 2O2 = ZnSO4
+deltaH = 2*deltaH_A + deltaH_B + deltaH_C + 2*deltaH_D;// [kcal/kmol for 2 kmol of ZnSO4]
+printf("Heat of formation of ZnSO4 is %.2f kcal/kmol\n",deltaH/2);
+\ No newline at end of file