How many tetrahedral voids are present in $0.4 \ mol$ of a compound that forms an $hcp$ structure?
- A$4.8 \times 10^{23}$
- B$3.011 \times 10^{23}$
- C$1.2 \times 10^{23}$
- D$2.4 \times 10^{23}$
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