\( \mathrm{NaCl} \) is doped with \( 2 \times 10^{-3} \) mole \( \%...

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\( \mathrm{NaCl} \) is doped with \( 2 \times 10^{-3} \) mole \( \% \mathrm{AlCl}_{3} \) the
P concentration of cation vacancies is

W \( \left(\mathrm{N}_{\mathrm{A}}=6 \times 10^{23}\right) \)
(A) \( 6.0 \times 10^{18} \mathrm{~mol}^{-1} \)
(B) \( 2.4 \times 10^{19} \mathrm{~mol}^{-1} \)
(C) \( 3.0 \times 10^{18} \mathrm{~mol}^{-1} \)
(D) \( 2.4 \times 10^{21} \mathrm{~mol}^{-1} \)
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