How many unit cells are present in a cube shaped ideal crystal of $NaCl$ of mass $\text{1}\text{.00}\text{g}$ ?

$\left[\text{Atomic mass}:Na=23,\mathrm{ }Cl=35.5\right]$

• Correct answer
  A

  $2.57\times {10}^{21}$
• B

  $5.14\times {10}^{21}$
• C

  $1.28\times {10}^{21}$
• D

  $1.71\times {10}^{21}$

Hence, the correct answer is option: 'A'.