Question

Al crystallizes in FCC structure. Calculate the molar mass of Al atoms, if length of the unit cell is 404 pm and density of Al is 2.7 g/cm

322.6 amu
26.81 amu
30.3 amu
19.7 amu
​

Answer 1

Answer:

I don't know.................

Answer 2

Answer:

Density of cubic unit cell -

 

- wherein

Where,

d = density of crystal

z = no. of effective constituent particles in one unit cell

M = molecular weight

a = edge length of unit cell

No = 6.022*1023

 

 

 

Density of cubic unit cell, 

For an FCC, 

Given that