Why are the heats of formation of gaseous atoms from their elements endothermic quantities?

Name: Problem 53, Chapter 18: Chemistry: The Molecular Nature of Matter
Uploaded: 2021-08-24T13:11:51-08:00
Duration: 1 min 16 s
Channel: David Collins
Description: Why are the heats of formation of gaseous atoms from their elements endothermic quantities?

step 1 Question number 53 is in reference to the heats of formation of gaseous atoms from their element

Why are the heats of formation of gaseous atoms from their...

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Key Concepts

Heats of Formation

Heats of formation, particularly for gaseous atoms, represent the enthalpy change when an element in its standard state is converted into isolated gaseous atoms. This process often involves breaking strong intermolecular or intramolecular bonds present in the elemental form, which requires the absorption of energy, making the reaction endothermic.

Bond Dissociation Energy

Bond dissociation energy is the amount of energy required to break a chemical bond between two atoms in a molecule. For gaseous atoms derived from diatomic or other molecular elements, the significant energy needed to overcome bond energies contributes to the endothermic nature of their formation.

Endothermic Process

An endothermic process is one in which energy is absorbed from the surroundings. The formation of gaseous atoms from elements is endothermic because energy must be supplied to break the bonds holding the atoms together in the more stable molecular or crystalline forms.

Atomization Energy

Atomization energy is the energy required to convert a substance into its individual atoms in the gas phase. For elements present as molecules in their standard state, the atomization process involves bond breaking and energy absorption, leading to a positive, endothermic value for the heat of formation of gaseous atoms.

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