Solid State - Result Question 35

####35. A crystalline solid of a pure substance has a face-centred cubic structure with a cell edge of 400pm. If the density of the substance in the crystal is 8gcm3, then the number of atoms present in 256g of the crystal is N×1024. The value of N is

(2017 Adv.)

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Answer:

Correct Answer: 35. (2)

Solution:

  1. Density (ρ)=8=4×MNA(4×108cm)3

M=128×1024NA No of atoms =256M×NA =256128×1024NA×NA=2×1024



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