If enthalpy of atomisation for

Question:

If enthalpy of atomisation for $\mathrm{Br}_{2}(\mathrm{I})$ is $x \mathrm{~kJ} / \mathrm{mol}$ and bond enthalpy for $\mathrm{Br}_{2}$ is $y \mathrm{~kJ} / \mathrm{mol}$, the relation between them:

  1. is $x=y$

  2. does not exist

  3. is $x>y$

  4. is $x


Correct Option: , 3

Solution:

$\Delta \mathrm{H}_{\text {atomisation }}=\Delta \mathrm{H}_{\text {vap }}+$ Bond energy

Hence $x>y$

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