Calculate the number of unit cells in $10.8 \ g$ of metal,given that $\rho a^3 = 7.2 \times 10^{-22} \ g$.

  • A
    $1.5 \times 10^{22}$
  • B
    $3.0 \times 10^{22}$
  • C
    $4.5 \times 10^{22}$
  • D
    $6.0 \times 10^{22}$

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