//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);