BITSAT 2014 Paper

The packing efficiency = 0.68, means the given lattice is BCC.
The closest distance of approach = 2r
2r = 2.86

0

A

= The packing efficiency = 0.68, means thegiven lattice is BCC.The closest distance of approach = 2√3
or a =

2×2.86

√3

= 3.30

0

A

Let atomic weight of the element = a
∴

2×9

36×1023×(3.3)3×10−24

= 8.57
a = 8.57 × 3 × (3.3)3 × 0.1
= 92.39 ~ 93 amu