JEE Main Chemistry question
Not in JEE Main or NEET syllabus
A crystalline solid of a pure substance has a face-centred cubic structure with a cell edge of 400 pm. If the density of the substance in the crystal is 8 g cm, the number of atoms present in 256 g of the crystal is . The value of is . [JEE Advanced 2017]
Answer: 2
Solution
From with and cm, \dfrac{dN_Aa^3}{Z}\dfrac{8×6.02×10^{23}×6.4×10^{-23}}{4}$≈77.06\
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