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A diatomic molecule X2 has a body- centr...

A diatomic molecule `X_2` has a body- centred cubic (bcc) structure with a cell edge of 300pm. The density of the molecuel is `6.17 g cm^(-3)`. The number of molecules present in 200 g of `X_2` is :
(Avogadroconstant `(N_A)= 6 xx 10^23 mol^(-1)`)

A

`40 N_A`

B

`8 N_A`

C

`4 N_A`

D

`2N_A`

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