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+//ques-18.6
+//Calculating standard heat of formation of n heptane
+clc
+E1=-1150;//internal energy change at constant volume (in kcal)
+h2=-94;//heat of formation of carbon dioxide (in kcal)
+h3=-68;//heat of formation of carbon dioxide (in kcal)
+H=7*h2+8*h3-E1;//heat of formation
+printf("Heat of formation of n-heptane is %d kcal/mol.",H);