10 moles of NaF and 10 moles of AlF(3) a...

10 moles of NaF and 10 moles of `AlF_(3)` are mixed and uniformly recrystallised to get an FCC Lattice of Fluoride ions. The number of cationic octahedral vacancies formed due to this is 5x. What is x ? (Cations occupy 'oh' voids)

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