An element P (atomic weight = 80 g/mol) having fcc structure, calculate number of unit cells in 8 gm of P

Question

An element P (atomic weight = 80 g/mol) having fcc structure, calculate number of unit cells in 8 gm of P, 0.4 × N A, 0.1 × N A, 4 × N A, None of these

MARKS App · Accepted Answer

Number of atoms in fcc = 4 Total number of atoms = w a t o m i c wt. × N A Total number of atoms = 8 80 × N A = N A 10 Number of unit cell = N A 10 × 1 4 = 6.0 4 × 1 0 22 = 1.5 × 1 0 22

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