The metal has a fcc lattice. The edge length of the unit cell is 404 pm. The density of the metal is 2.72 g/cm3. The molar mass of the metal is (NA =Avogadro's constant 6.02 10 mol ) x (NEET 2013)

Given cell is fcc So, Z= 4 Edge length, a = 404 pm 8 4.04 10 cm x Density of metal d = 2.72 g / cm3 23 1 A N 6.02 10 mol x Molar mass of the metal, M = ? We know that, 3 A 3 A d.a N Z M Density d M Z a .N x >> 3 8 23 2.7 4.04 10 6.02 10 4 x x x x 26.79g / mol 27g / mol Solid state 30