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Iron crystallises in a bcc system with a...

Iron crystallises in a bcc system with a lattice parameter of 2.861 Å. Calculate the densityof iron in the bccc system (atomic weight of Fe = 56,
`N_A=6.02xx10^23 mol^(-1)`

A

`7.94 gcm^(-3)`

B

`8.96 g cm^(-3)`

C

`2.78 gcm^(-3)`

D

`6.72 gcm^(-3)`

Text Solution

Verified by Experts

The correct Answer is:
A
`d=(ZM)/(N_Aa^3)` (for bcc, Z=2)
`d_(Fe) = ((2)xx56.0gmol^(-1))/((6.02xx10^23mol^(-1)(2.861xx10^(-8))^3cm^3)`
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The number of atoms in 0.1 mol of a tetraatomic gas is ( N_(A) = 6.02 xx 10^(23) mol^(-1) )

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