Solid

An element crystallizes into a structure which may be described by a cubic type of unit cell having one atom in each corner of the cube and two atoms on one of its face diagonals. If the volume of this unit cell is 24 x 10-24cm3 and density of the element is 7.20gm/cm3, calculate no. of atoms present in 200gm of the element.
I got 3 diff type of ans in 3 diff books.
KINDLY GIVE ME SOLUTION

1 Answers

481
Anurag Ghosh ·

I could have done it in this way....
Molecular Mass of the element=density*volume = 24 x 10-24*7.20
Now, no. of atoms= no. of moles*(6.02*10^23)
no. of moles(n)=200/M.W
Now you can proceed..
The cubic type of cell may be required to calculate the effective no. of atoms in the cubic unit cell i.e
8/8 + 12/2 =7

Your Answer

Close [X]