Calculate the molar mass of an element having density $7.8 \ g \ cm^{-3}$ that forms a $bcc$ unit cell. $\left[a^3 \cdot N_{A} = 16.2 \ cm^3 \ mol^{-1}\right]$
- A$63.18 \ g \ mol^{-1}$
- B$61.23 \ g \ mol^{-1}$
- C$59.31 \ g \ mol^{-1}$
- D$65.61 \ g \ mol^{-1}$
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