Calculate the molar mass of an element having density $$21 \mathrm{~g} \mathrm{~cm}^{-3}$$ that forms fcc unit cell $$\left[\mathrm{a}^3 \cdot \mathrm{N}_{\mathrm{A}}=36 \mathrm{~cm}^3 \mathrm{~mol}^{-1}\right]$$
- A$$292.00 \mathrm{~g} \mathrm{~mol}^{-1}$$
- B$$189.00 \mathrm{~g} \mathrm{~mol}^{-1}$$
- C$$140.00 \mathrm{~g} \mathrm{~mol}^{-1}$$
- D$$108.00 \mathrm{~g} \mathrm{~mol}^{-1}$$
✓ Correct answer: B
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