What is the mass of a $bcc$ type unit cell of sodium if the mass of one atom of sodium is $3.819 \times 10^{-23} \ g$?
- A$7.038 \times 10^{-23} \ g$
- B$7.638 \times 10^{-23} \ g$
- C$3.819 \times 10^{-23} \ g$
- D$1.5276 \times 10^{-22} \ g$
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