An atom forms face centred cubic crystal with density d = 8.92g/mL and edge length a 3.6 10 cm x . The molecular mass of atom in amu is (JIPMER 2018)

Given, Density (d) = 8.92 g/mL Edge length 8 a 3.6 10 cm x Z 4 fcc The molecular mass of atom in a lattice can be calculated by using the formula, 3 A Z M d N a x 3 A dN a M Z 3 3 23 8 8.92 6.023 10 3.6 10 M 4 x x x x M 62.66 63amu