Question

calculate the molality of 2M solution of a solute whose molar weight is 64, if the density of the solution is 1.2g/ml

Answer 1

Answer:

Answer

Open in answr app

Correct option is

C

2.22

1ml of solution contains 1⋅02gm.

1000 ml or 1 L of solution ⟶1⋅02×1000 gm

                                      =1020gm

Number of moles =Molarity×V

                              =2×1=2moles

Weight of solute =Molecular weight×moles

               =60×2=120gm

Weight of solvent =1020−120=900gm

Molality=Weight of solvent ( in Kg)Moles of solute

Molality=2×9001000

                  =2⋅22m

Option C is correct.