If 1 mole of \( \mathrm{NaCl} \) is doped with \( 10^{-3} \) mole of \( \mathrm{SrCl}_{2} \). Wh...

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If 1 mole of \( \mathrm{NaCl} \) is doped with \( 10^{-3} \) mole of \( \mathrm{SrCl}_{2} \). What is the number of cationic vacancies per mole of \( \mathrm{NaCl} \) ?
(1) \( 10^{-3} \) mole \( ^{-1} \)
(2) \( 6.02 \times 10^{18} \mathrm{~mole}^{-1} \)
(3) \( 10^{50} \) mole \( ^{-1} \)
(4) \( 6.02 \times 10^{20} \mathrm{~mole}^{-1} \)
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