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\( \mathrm{NaCl} \) is doped with \( 2 \times 10^{-3} \) mole \( \% \mathrm{SrCl}_{2} \), the concentration of cation vacancies is \( \left(N_{\mathrm{A}}=6 \times 10^{23}\right) \)
(a) \( 6.0 \times 10^{18} \mathrm{~mol}^{-1} \)
(b) \( 1.20 \times 10^{19} \mathrm{~mol}^{-1} \)
(c) \( 3.0 \times 10^{18} \mathrm{~mol}^{-1} \)
(d) \( 1.20 \times 10^{21} \mathrm{~mol}^{-1} \)
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