An element with molar mass 2.7 x 10kg mol from a cubic unit cell with edge length 405 pm. If its density is 2.7 x 10 3 , what is the nature of the cubic unit cell?
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Answer:
Four atoms of the element are present per unit cell.
Hence, the unit cell is face-centred cubic (fcc) or cubic close-packed (ccp).
Explanation:
It is given that density of the element, d = 2.7 × 10³ kg
Molar mass, M = 2.7 × kg
Edge length, a = 405 pm = 405 × m = 4.05 × m
Avogadro’s number, NA = 6.022 ×
Applying the relation,
z = 2.7 × 10³ kg × (4.05 × m)³ ×6.022 × ÷ 2.7 × kg
z = 4.004
z = 4
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