S C Kheterpal, S N Dhawan and, P N Kapil Solutions for Chapter: Classification of Elements and Periodicity in Properties, Exercise 5: PROBLEMS FOR PRACTICE

The electron affinity of bromine is $3.36 \mathrm{e} \mathrm{V}$. How much energy in $\mathrm{kcal}$ is released when $8 \mathrm{g}$ of bromine is completely converted to ${\mathrm{Br}}^{-}$ ions in the gaseous state? ($1 \mathrm{e} \mathrm{V}=23.06 \mathrm{kcal} {\mathrm{mol}}^{-1}$).

The amount of energy released when one million atoms of iodine are completely converted into ${\mathrm{I}}^{-}$ ions in the vapour state according to the equation, $\mathrm{I}\left(\mathrm{g}\right)+{\mathrm{e}}^{-}\stackrel{ }{\to }{\mathrm{I}}^{-}\left(\mathrm{g}\right)$ is $4.9\times {10}^{-13} \mathrm{J}$. Calculate the electron affinity of iodine in $\mathrm{kJ} {\mathrm{mol}}^{-1}$.

The amount of energy released when one million atoms of iodine are completely converted into ${\mathrm{I}}^{-}$ ions in the vapour state according to the equation, $\mathrm{I}\left(\mathrm{g}\right)+{\mathrm{e}}^{-}\stackrel{ }{\to }{\mathrm{I}}^{-}\left(\mathrm{g}\right)$ is $4.9\times {10}^{-13} \mathrm{J}$. Calculate the electron affinity of iodine in $\mathrm{e} \mathrm{V}$ per atom.