An element of atomic mass 98.5 g mol-1 occurs n FCC structure. If its unit cell edge length is 500 pm and its density is 5.22 g cm-3, what will be the value of Avogadro'* constant?
N = (4 x 98.5)/[5.22 x (500 x 10-10) 3] = 6.023 x 1023.
