NTA Abhyas JEE Main2020ChemistrySolid StatePractice

The number of unit cells present in 1 g cube shaped ideal crystal of solid A + B - (with CCP close packing) (formula mass = 60 ) are

Options

A2.5 × 1 0 21
B6.02 × 1 0 23
C4.0 × 1 0 22
D1.0 × 1 0 22

Correct answer

A. 2.5 × 1 0 21

Step-by-step solution

Number of moles present in 1 g = 1 60 So number of formula units in 1 60 moles = 1 60 × 6.023 × 1 0 23 = 1 0 22 = 10 × 1 0 21 Since 4 formula units constitute a unit cell So number of unit cells present = 10 4 × 1 0 21 = 2.5 × 1 0 21

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