dHfH2O=-68.32;//dHf value of H2O in kcal per mol//
dHfCO2=-94.05;//dHf value of CO2 in kcal per mol//
dH298=-208.34;//enthalphy change at 298K in Kcal//
dHfCH3COOH=(2*dHfH2O+2*dHfCO2-dH298);//dHf value of CH3COOH in Kcal per mol//
printf('Standard enthalpy of formation of CH3COOH=%fKcal per mol',dHfCH3COOH);