Calculate the molar mass of an element having density $21 \ g \ cm^{-3}$ that forms $fcc$ unit cell $[a^3 \cdot N_{A} = 36 \ cm^3 \ mol^{-1}]$
- A$292.00 \ g \ mol^{-1}$
- B$189.00 \ g \ mol^{-1}$
- C$140.00 \ g \ mol^{-1}$
- D$108.00 \ g \ mol^{-1}$
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