Calculate the molar mass of an element with density $2.7 \ g \ cm^{-3}$ that forms $fcc$ structure. $\left[a^3 \cdot N_{A}=40 \ cm^3 \ mol^{-1}\right]$
- A$112 \ g \ mol^{-1}$
- B$54 \ g \ mol^{-1}$
- C$27 \ g \ mol^{-1}$
- D$78 \ g \ mol^{-1}$
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