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## Main Question or Discussion Point

Determine the number of vacancies per cm^3 needed for a BCC iron crystal to have a density of 7.87 g/cm^3. The lattice parameter of the iron is 2.866x10^-8 cm and the atomic weight of the iron is 55.847 g/mol. Given: Avogradro's number, N=6.022x10^23 atoms/mol

Help please? i have no idea how to solve this question :( im gona have my first test for material science on wednesday!!

Help please? i have no idea how to solve this question :( im gona have my first test for material science on wednesday!!