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X-ray diffraction studies show that copp...

X-ray diffraction studies show that copper crystallises in a fcc unit cell with cell edge of `3.608xx10^(-8)` cm. In a separate experiment, copper is determined to have a density of `8.92g//cm^(3)`. Calculate the atomic mass of copper.

A

156

B

63

C

40

D

23

Text Solution

Verified by Experts

The correct Answer is:
B
`d=(ZxxM)/(a^(3)xxN_(A))`
`M=(d xxa^(3)xxN_(A))/(2)=(8.92xx(3.6xx10^(-8))^(3)xx6xx10^(23))/(4)`
=63`
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