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Material science: Imperfections in solids

 
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Jun23-12, 07:39 PM   #1
 

Material science: Imperfections in solids

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!!
 
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Jun23-12, 09:13 PM   #2
 
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How many atoms in a unit cell? How many unit cells in 1 cm3? What is the average mass of an iron atom?

What is the theoretical mass of a cm3 of Fe?
 
Jun23-12, 09:23 PM   #3
 
theyre not given:( that is why im having a hard time solving the question now sir
 
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