Question -
Answer -
It is giventhat NaCl is doped with 10−3 mol% of SrCl2.
This means that 100mol of NaCl is doped with 10−3 mol of SrCl2.
Therefore, 1 mol of NaCl isdoped with
mol of SrCl2= 10−5 mol of SrCl2
Cation vacanciesproduced by one Sr2+ ion = 1
Hence, the concentrationof cation vacancies created by SrCl2 is 6.022 × 108 per mol of NaCl.