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19/09/2020 7:55 pm
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A diatomic molecule X2 has a body-centred cubic (bcc) structure with a cell edge of 300 pm. The density of the molecule is 6.17 g cm–3. The number of molecules present in 200 g of X2 is:
(1) 4NA
(2) 2NA
(3) 40NA
(4) 8NA
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1 Answer
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19/09/2020 7:55 pm
(1) 4NA
Explanation:
For BCC Z = 2
d = Z x M/NA x Volume
6.17 = 2 x M/6.02 x 1023 x [3 x 10-8]3
6.17 = 2 x M/6.02 x 2.7
M = 50
No. of mole = 200/50 = 4
No. of molecule = 4NA