Heats of formations are intimately related to group additivity methods aside from computational methods such as molecular mechanics.
12.
Here the objective is to use parameters to fit experimental heats of formation, dipole moments, ionization potentials, and geometries.
13.
The branched isomers are more stable ( have lower heat of formation and heat of combustion ) than n-pentane.
14.
The heat of formation of the trimer from the monomer ( BFO ) 3 ?! 3BFO is 131 kcal / mol.
15.
It reacts as a gas with trimethylphosphine to form a solid Lewis salt with a heat of formation of-41 kcal per mol.
16.
The predicted heat of formation for liquid trimethyldiborane is ?H 0 f =-48 kcal / mol, and for the gas-41 kcal / mol.
17.
:: The standard heat of formation of water from H 2 and O 2 is 241.8 kJ / mol or 2.50608036 electron volts.
18.
The predicted heat of formation for the liquid is ?H 0 f =-31 kcal / mol, and for the gas-25 kcal / mol.
19.
Heats of formation can be determined experimentally though calorimetric studies; however, calculated enthalpies are more commonly used due to the greater ease of acquisition.
20.
For complex molecules, a ?H f ?value may not be available but can be estimated using molecular fragments with known heats of formation.
