Question

Calculate the no. of unit cells in 8.1g of aluminium it it crystallizes in a f.c.c structure.
(At. mass of AI = 27g/mole)​

Answer 1

Answer:

4.51 x 10^22

Explanation:

Mass of AL= 8.1

Atomic mass of AL= 27

Number of atoms= (8.1 x 6.022 x 10^23)/27  =  1.8 x 10^23

No. of unit cells = 1.8 x 10^23 / 4             (Divided by 4 cuz  1 fcc has 4 atoms)

                          = 4.51 x 10^22

Answer 2

Explanation:

it is easy

convert and solve

its important to remember the no of atoms in unit cell of

1. FCC = 4
2. BCC= 2
3. SCC or Primitive = 1