Question

The unit cell of a metallic element is face centred cubic and the side of the cube is 540.2
pm. Calculate the density of a metal in gcm is if its relative atomic mass is 202.4.​

Answer 1

Answer:

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Explanation:

12th

Chemistry

The Solid State

Number of Atoms in a Unit Cell

The unit cell of a metallic...

CHEMISTRY

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Asked on December 20, 2019 by

Lasya Mathu

The unit cell of a metallic element of atomic mass 108 and density 10.5 g/cm

3

is a cube with edge length of 409 pm. The structure of the crystal lattice is:

MEDIUM

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ANSWER

We know that,

Density-

d=

a

3

×NA

Z×M

Given :

Molar Mass(M)=108g/mol

Density (d)=10.5g/cm

3

Edge Length(a)=409pm

Z=

M

d×a

3

×N

A

Value of N

A

is N

A

=6.023×10

23

Z=

108

10.5×(409×10

−10

cm

3

)

3

×6.023×10

23

=4

Number of atoms =4

Hence the element is packed in FCC structure.

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