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

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How many unit cells are present in a cube shaped lattice crystal of \( \mathrm{NaCl} \) of mass \( 1.00 \mathrm{~g} \) ?
[Atomic mass : \( \mathrm{Na}=23, \mathrm{Cl}=35.5 \) ]
(a) \( 2.57 \times 10^{21} \)
(b) \( 5.14 \times 10^{21} \)
(c) \( 1.28 \times 10^{21} \)
(d) \( 1.71 \times 10^{21} \)
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