Verified Solution • 2025–26 Session moderate

QNEET-2022-Ch-393: NEET 2022 Chemistry - Class 12 NEET-2022-Ch-393 Solution: Copper crystallises in fcc unit cell with cell edge length of…

Copper crystallises in fcc unit cell with cell edge length of 3.608×10−8 cm3.608 \times 10^{-8}\ \text{cm}. The density of copper is 8.92 g cm−38.92\ \text{g cm}^{-3}. Calculate the atomic mass of copper. 63.1 u 31.55 u 60 u 65 u

Multiple Choice Options

  • A 63.1 u
  • B 31.55 u
  • C 60 u
  • D 65 u

Step-by-Step Verified Solution

d = Z M N A ( a ) 3 Z = 4(FCC), d = 8.92 g cm _ 3 , N A = 6.023 _ 10 23 , a = 3.608 _ 10 _ 8 cm M = d N A ( a ) 3 Z = 8.92 _ 6.023 _ 10 23 _ ( 3.608 _ 10 _ 8 ) 3 4 = 8.92 _ 6.023 _ 10 23 _ 46.97 _ 10 _ 24 4 = 2523.47 _ 10 _ 1 4 = 630.8 _ 10 _ 1 = 63.08 _ 63.1 u

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