Al^(3+) ions replace Na^(+) ions at the edge centres of NaCl lattice. The number of vacancies in one mole NaCl is found to be x10^(23). The value of xapproximately is

Al^(3+) ions replace Na^(+) ions at the edge centres of NaCl lattice.

1.	Al^(3+) ions replace Na^(+) ions at the edge centres of NaCl lattice. The number of vacancies in one mole NaCl is found to be x10^(23). The value of xapproximately is
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