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What is enthalpy of atomisation?

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What is enthalpy of atomisation?

Posted by Atharva Verma 3 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Anmol Agarwal 3 years, 11 months ago

The enthalpy of atomization is the enthalpy change that accompanies the total separation of all atoms in a chemical substance. This is often represented by the symbol ΔₐₜH or ΔHₐₜ. All bonds in the compound are broken in atomization and none are formed, so enthalpies of atomization are always positive.

Yogita Ingle 3 years, 11 months ago

Enthalpy of atomization, Δ_aH⁰, is the change in enthalpy when one mole of bonds is completely broken to obtain atoms in the gas phase. For example: atomization of methane molecule.

CH₄ (g) → C (g) + 4H (g) Δ_aH⁰= 1665.0 kJ mol^-1

For diatomic molecules, enthalpy of atomization is equal to the enthalpy of bond dissociation. For example: atomization of dihydrogen molecule.

H₂(g) → 2H (g); Δ_aH⁰= 435.0 kJ mol^-1

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