1.18 An element with molar mass 2.7×10-2 kg mol-1 forms a cubic unit cell with edge length 405 pm. If its density is 2.7×103 kg m-3, what is the nature of the cubic unit cell?
1.18 An element with molar mass 2.7×10-2 kg mol-1 forms a cubic unit cell with edge length 405 pm. If its density is 2.7×103 kg m-3, what is the nature of the cubic unit cell?
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1 Answer
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1.18 Molar mass of the element = 2.7*10-2 kg mol-1
Edge length, a = 405 pm
Density, d = 2.7*103 kg m-3
Using the formula, d=? *? / ? 3NA
Putting the values given at their appropriate place, we get(2.7 X 103 )X (405 X 10-12)3 X 6.022 X 10 / 2.7*10-2 = 3.99 which is approximately equal to 4
Therefore, it is an fcc unit cell
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