How many unit cells are present in $39 \ g$ of potassium that crystallizes in a body-centered cubic $(BCC)$ structure? [Atomic weight of $K = 39$]

  • A
    $6.02 \times 10^{23}$
  • B
    $\frac{6.023 \times 10^{23}}{4}$
  • C
    $\frac{6.023 \times 10^{23}}{2}$
  • D
    $\frac{3}{4} \times 6.02 \times 10^{23}$

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