MEDIUMMCQ SINGLEJEE Advanced ChemistryInorganic ChemistrySolid stateCu Ag Au

The number of atoms in 100 g of an FCC crystal with density d = 10 g cm –3 and cell edge as 200 pm is equal to

A.3 × 10

B.0.5 × 10✓ Correct

C.1 × 10

D.2 × 10

Explanation

Density= 3 10 / g cm Cell edge = 200pm = 10 200 10 cm x 3 3 23 8 . 4 . 6.023 10 2 10 x x x x A Z M M d N a 23 24 4 10 6.023 10 8 10 4 40 48 0.1 48 48 12 4 M M M M g x x xx x 23 12 6.023 10 g x atoms 23 25 6.023 10 100 100 0.5 10 12 g x x x atoms

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