The first ( $I E_{1}$ ) and second ( $I E_{2}$ ) ionisation enthalpies $(\mathrm{kJ} /$ mole $)$ of

Question

The first ( $I E_{1}$ ) and second ( $I E_{2}$ ) ionisation enthalpies $(\mathrm{kJ} /$ mole $)$ of element, $A$ are given below. \ In an experiment $1 / 12$ mole of $A$ atom in vapour phase absorb 100 kJ of energy. So that it forms a mixture of $A^{+}$and $A^{2+}$ ions. Energy utilized to form $A^{2+}$ from $A^{+}$in experiment is\

Professor PC Thomas Classes · Answer

(d) : Energy required to convert $A$ to $A^{+}$ 
$ =\frac{1}{12} 	imes 750=62.5 \mathrm{~kJ} $ 
Remaining energy converts $A^{+}$to $A^{2+}=100-62.5=37.5 \mathrm{~kJ}$.\