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QNEET-2016-Ch-1030: NEET 2016 Chemistry - Class 12 NEET-2016-Ch-1030 Solution: Lithium has a bcc structure. Its density is \(530\ {kg…
Lithium has a bcc structure. Its density is and its atomic mass is . Calculate the edge length of a unit cell of lithium metal. () 527 pm 264 pm 154 pm 352 pm
Multiple Choice Options
- A 527 pm
- B 264 pm
- C 154 pm
- D 352 pm
Step-by-Step Verified Solution
For bcc structure we have, Z = 2
Given, _ = 530 kg m �3
atomic mass of Li = 6.94 mol �1
N A = 6.02 _ 10 23 mol �1
_ = 530 kg m �3 = 530 _ 1000 ( 100 ) 3 = 0.53 g cm �3
Also, _ = z _ A t . m a s s N A _ a 3
_ a 3 = Z _ A t . m a s s N A _ _
= 2 _ 6.94 6.02 _ 10 23 _ 0.53
= 43.5 _ 10 -10 cm 3
_ a = 352 _ 10 �10 cm = 352 pm