Question

FeO is dopped with 2 moles of Al2O3 find cation vacancies​

Answer 1

Answer:

say questions properly i cant understand the question

Answer 2

Answer:

In $FeO$ crystal lattice, 2 moles of cation vacancies created on doping with $2 moles$ of $Al_{2}O_{3}$.

Explanation:

Given: Number of moles of Al₂O₃ $=2 moles$

No. moles of $Al^{3+}$ ions present in 2 moles of $Al_{2}O_{3}$  $=4moles$

To keep $FeO$ crystal electrically neutral, we can replace three $Fe^{2+}$ with two $Al^{3+}$. At the same time, one cation vacancy is created in the crystal lattice.

Therefore 2 $Al^{3+}$ can create $=1$ cation vacancy

2 moles of $Al^{3+}$  create $=1mol$ cation vacancy

4moles of $Al^{3+}$ can create $=\frac{4}{2}=2moles$ cation vacancies