How many unit cells are present in a cube shaped ideal crystal of \...

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How many unit cells are present in a cube shaped ideal crystal of \( \mathrm{NaCl} \) of mass \( 1.00 \mathrm{~g} \) ?
(A) \( 5.14 \times 10^{21} \)
(B) \( 1.28 \times 10^{21} \)
(C) \( 1.71 \times 10^{21} \)
(D) \( 2.57 \times 10^{21} \)
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