Question

The first and second electron gain enthalpies of $O\left(g\right)are-141KJ/mol$ and $+780kj/mol$ respectively. The energy required to convert all the atoms of oxygen to $O^{-2}\left(g\right)present$ in $160mg$ of oxygen atoms in vapor phase is

• A. $6.39KJ$
• B. $9.21KJ$
• C. $92.1KJ$
• D. $63.9KJ$

Answer 1

The correct option is D $63.9KJ$

Energy= $780-141=639kJ/mol$

For $160mg$ of Oxygen in vapour phase= $\frac{639}{10}=63.9kJ$ .