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NCERT Class XII Chemistry
Chapter - The Solid State
Questions with Solutions

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Question : 15
Total: 50
Copper crystallises into a fcc lattice with edge length 3.61 × 10‌–8 cm. Show that the calculated density is in agreement with its measured value of 8.92 g cm‌–3.
Solution:  
G Given a=3.61×10−8 cm,Z=4( for fcc),M=63.5( for Cu),NA=6.022×1023,d=?
Using formula, ‌ d=
Z×M
a3×NA
=
4×63.5
(3.61×10−8 )3×(6.022×1023)
=8.97g cm−3
This value is in close agreement with the measured value (8.92 g cm‌–3).
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