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Question: An element X (At. wt. = 80 g/mol) having fcc structure, calculate no. of unit cells in 8 gm of X:...

An element X (At. wt. = 80 g/mol) having fcc structure, calculate no. of unit cells in 8 gm of X:

A

0.4 × NA

B

0.1 × NA

C

4 × NA

D

NA/40

Answer

NA/40

Explanation

Solution

Effective no. of atom in a unit cell = 4

no. of atom = 880×NA\frac{8}{80} \times N_{A}

\ no of unit cell = NA10×14\frac{N_{A}}{10} \times \frac{1}{4} = NA40\frac{N_{A}}{40}