MHT CET 2023 Chemistry question
Not in JEE Main or NEET syllabus
Calculate the number of atoms present in unit cell of an element having molar mass 190 g mol and density 20 g cm [a .N = 38 cm mol]
Answer: (D)
Solution
Density of a cubic unit cell: , so \dfrac{ρ a^3 N_A}{M}\dfrac{20\ \mathrm{g cm^{-3}} × 38\ \mathrm{cm^3 mol^{-1}}}{190\ \mathrm{g mol^{-1}}}$ =
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