accuracy of bond enthalpies

[Ryan Yoon 1L]

Why is it that using bond enthalpies is the least accurate method to calculate energy transfer?

[Connie Chen 1E]

Only the bond enthalpies of diatomic molecules are accurate. All other bond enthalpies are calculated from averages of many different molecules, which results in less accurate calculations.

[Amanda Mei 1B]

For all molecules that are not diatomic, their bond enthalpies are averages from the bonds in many different molecules. For example many molecules can have a C-H bond, and the bond enthalpies of each one is different.

[EvanWang]

Because they are not tailor-made to every type of bond in every molecule, they are an average of the energy required to break bonds across many different molecules. For example, the O-H bond in CCl3COOH is different than the O-H bond in CCH3COOH because we know that the Cl pulls electrons more than H and results in a weaker O-H bond. However, we use only one value for O-H bonds when referring to bond enthalpy. Examples such as this result in inaccuracies.

[Jocelyn Thorp 1A]

the values are experimental and are an estimate based off of a ton of different possible bond pairings!

[Rosa Munoz 2E]

Because it uses averages.

[Noe BM 1J]

Because it uses the average of many molecules.

[Owen-Koetters-4I]

averages are used for molecules that are not diatomic

[ABombino_2J]

The bond enthalpy method is the least accurate because all the bond enthalpy es are averages of many molecules.