What is the number of tetrahedral voids present in $0.5 \text{ mole}$ of a compound forming an $hcp$ structure?
- A$1.223 \times 10^{23}$
- B$3.628 \times 10^{23}$
- C$4.487 \times 10^{23}$
- D$6.022 \times 10^{23}$
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