CBSENEETJEEClass 11
What is enthalpy of atomisation?
Answer
Enthalpy of atomisation is the enthalpy change when one mole of a substance is completely broken into its gaseous atoms.
The working
Definition
It is the energy needed to convert one mole of a substance entirely into free gaseous atoms.
Symbol
It is denoted by Δ_a H° and is always positive because bonds must be broken.
For diatomic molecules
For a molecule like H₂, the enthalpy of atomisation equals the bond dissociation enthalpy of the H–H bond.
Example
H₂(g) → 2H(g) has Δ_a H° = 435.0 kJ/mol, the energy to split one mole of hydrogen molecules into atoms.
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