Question

A face centered cubic element has an edge of 400pm calculate its density if its atomic mass 60

Answer 1

Explanation:

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) )

Hope it helps!!

Answer 2

Answer:

6.23 g cm^-3

Explanation:

Density =  Z×M / N°×V

​  Z=4 and V=(4×10^  −8  )^  3  cm^  3

 (1 pm=10^−12  m=10^ −10 cm)

Substituting in the formula we get,

Density=  4×60 / 6.023×10 ^23  ×64×10^ −24

Density =6.23 g cm^−3