# NEET Chemistry The Solid State Questions Solved

BOARD

A compound forms hcp structure. What is the total number of voids in 0.5 mol of it? How many of these are tetrahedral voids?

No. of atoms in the hcp = 0.5$×$6.022$×$1023

= 3.011$×$1023

No. of octahedral voids

= No. of atoms in packing = 3.011$×$1023

No. of tetrahedral voids

= 2$×$No. of atoms in packing

= 2$×$3.011$×$1023 = 6.022 $×$1023

$\therefore$ Total number of voids

= 3.011$×$1023 + 6.022$×$1023 = 9.033$×$1023

Difficulty Level:

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