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diff --git a/1427/CH18/EX18.1/18_1.sce b/1427/CH18/EX18.1/18_1.sce
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+//ques-18.1
+//Calculating heat of formation of ethyl alcohol
+clc
+h1=-333;//heat of combustion of ethyl alcohol (in kcal)
+h2=-94.3;//heat of formation of carbon dioxide (in kcal)
+h3=-68.5;//heat of formation of water (in kcal)
+H=2*h2+3*h3-h1;//heat of formation of ethyl alcohol (in kcal)
+printf("Heat of formation of ethyl alcohol is %.1f kcal.",H);