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X-rays diffraction studies show that cop...

`X`-rays diffraction studies show that copper crystallizes in an fcc unit cell with cell edge of `3.608 xx 10^(-8) cm`. In a separte experiment, copper is determined to have a density of `8.92 g 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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