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What is enthalpy of atomisation?

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What is enthalpy of atomisation?

    • Posted by Atharva Verma 4 years, 11 months ago

    CBSE > Class 11 > Chemistry
    • 2 answers

    Anmol Agarwal 4 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.

    1Thank You

    Yogita Ingle 4 years, 11 months ago

    Enthalpy of atomization, ΔaH0, 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)        ΔaH0= 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);                  ΔaH0= 435.0 kJ mol-1

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