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JEE Main202329 Jan 2023Evening ShiftChemistrySolid StateActual

A metal M forms hexagonal close-packed structure. The total number of voids in 0 . 02 mol of it is _____ × 10 21 (Nearest integer) (Given N A = 6 . 02 × 10 23 )

Correct answer

0

Step-by-step solution

From the diagram of voids in HCP: There are 6 octahedral voids and 12 tetrahedral voids in a HCP unit cell. One unit cell of HCP contains = 18 voids Thus, No. of voids in 0 . 02   mol of hcp = 18 6 × 6 . 02 × 10 23 × 0 . 02 ≈ 3 . 6 × 10 22 ≈ 36 × 10 21

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