A metal has BCC structure with edge length of unit cell 400 pm . Density of metal is 4 g cm − 3 What is molar mass of metal?

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​ d = N A ​ ⋅ a 3 ZM ​ a = 400 pm = 400 × 1 0 − 10 cm = 4 × 1 0 − 8 cm Z = 2 for BCC 4 = 6.022 × 1 0 23 × ( 4 × 1 0 − 8 ) 3 2 × M ​ M = 2 4 × 6.022 × 1 0 23 × 64 × 1 0 − 24 ​ = 77 g mol − 1 ​

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