Question

2.
An element has BCC unit cell, with edge length 108, if density is 0.2 g/cm, then molar mass of the compo:
is :-
(1) 240
(2) 60
(3) 35
(4) 280​

Answer 1

Given:

Density = 2

Z = 2 (As BCC unit cell)

To find:

Molar mass of the compound = ?

Formula to be used:

Density of unit cell = '

Where,

Z = No. of atoms

M = Mass

a= Bond length

Na= Avogadro constant

Calculation:

As 1 A° = 1×1 cm, ∴ 10A° = 1.0×

Substituting the values in the formula, it gives

M =

M =

M =

M =

Conclusion:

The molar mass of the compound with BCC unit cell with edge length 10A°,and density 2 gram per centimeter cube is gm/mol.  

Answer 2

Answer:

hi . ............ .....