A metal has a fcc lattice. The edge length of the unit cell is 404 pm . The density of the metal is 2.72 g cm -3 . The molar mass of the metal is ( N A Avogadro's constant = 6.02 10 23 mol -1 )

1. A. 40 g mol -1
2. B. 30 g mol -1
3. C. 27 g mol -1
4. D. 20 g mol -1

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