Question

Face Centered cubic element(atomic mass-60) has cell edge 400Pm. what is it's density?

Answer 1

FCC has 4 atoms in a cell

mass of cell = 240 u

mass of 1 mole cells = 240 g

Volume of a cell = [400 *10^(-12) ]³

volume of 1 mole cells = N * V(cell)

density = Mass / Volume

= 240 * 10^-3 kg / (6.022 *10^23 * V (cell) )