Question

If enthalpy of atomisation for $\mathrm{Br}_2(t)$ is $\times \mathrm{kJ} / \mathrm{mol}$ and bond enthalpy for $Br_{2}$ is y $k J / m o l$ , the relation between them

• A. is $x < y$
• B. is $x>y$
• C. does not exist
• D. is $x=7y$

Answer 1

Answer: (B)

Based on hess law it can be given as



As $\Delta H_{a t o m i s a t i o n}=\Delta H_{V a p .}+$ Bond Energy

Hence $x>y$