MHT CET202122 Sep 2021Morning ShiftChemistrySolutionsActual
If 6 ~g of solute dissolved in 100 ~g of water lowers the freezing point by 0.93 ~K . What is molar mass of solute? ( K _ f =1.86 ~K ~kg ~mol ⁻¹ )
Options
- A120 ~g ~mol ⁻¹
- B60 ~g ~mol ⁻¹
- C90 ~g ~mol ⁻¹
- D180 ~g ~mol ⁻¹
Correct answer
A. 120 ~g ~mol ⁻¹
Step-by-step solution
aligned & m = moles of solute mass of solvent 1000 & = 6 / M 100 1000= 60 M & T _ f = K _ f m & 0.93=1.86 60 M M = 1.86 60 0.93 =120 ~g ~mol ⁻¹ aligned