MHT CET20239 May 2023Evening ShiftChemistrySolid StateActual
Calculate the molar mass of an element having density 21 ~g ~cm ⁻³ that forms fcc unit cell [ a ^3 N _ A =36 ~cm ^3 ~mol ⁻¹ ]
Options
- A292.00 ~g ~mol ⁻¹
- B189.00 ~g ~mol ⁻¹
- C140.00 ~g ~mol ⁻¹
- D108.00 ~g ~mol ⁻¹
Correct answer
B. 189.00 ~g ~mol ⁻¹
Step-by-step solution
aligned & Density ( )= M n a^3 N_A & 21 ~g ~cm ⁻³= M 4 36 ~cm ^3 ~mol ⁻¹ & M = 21 ~g ~cm ⁻³ 36 ~cm ^3 ~mol ⁻¹ 4 & =189.00 ~g ~mol ⁻¹ & aligned