MHT CET202014 Oct 2020Evening ShiftChemistrySolid StateActual
An element with density 2 8 ~g ~cm ⁻³ forms fec unit cell having edge length 4 10⁻⁸ ~cm . Calculate molar mass of the element.
Options
- A33 0 ~g ~mol ⁻¹
- B22 0 ~g ~mol ⁻¹
- C27 0 ~g ~mol ⁻¹
- D36 0 ~g ~mol ⁻¹
Correct answer
C. 27 0 ~g ~mol ⁻¹
Step-by-step solution
=2.8 gcm ⁻³, a =4 10⁻⁸ ~cm , n =4( for fcc), M =? = n M a ³ N _ A M = a ³ N _ A n M= 2.8 (4 10⁻⁸ )³ 6.022 10²³ 4 =26.97 27 ~g ~mol ⁻¹