Calculate the mass of a $bcc$ unit cell if the metal has a molar mass of $56 \ g \ mol^{-1}$.
- A$1.86 \times 10^{-22} \ g$
- B$9.3 \times 10^{-24} \ g$
- C$2.79 \times 10^{-24} \ g$
- D$3.72 \times 10^{-22} \ g$
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