Question

The density of 2 M aqueous solution of NaOH is 1.28
g/cm3. The molality of the solution is [Given that
molecular mass of NaOH = 40 g mol']​

Answer 1

Answer:

HEYA! HERE YOU GO!

As we know the famous relation between molarity and molality we could solve it very quickly.

Let's see

m= 1000M /1000d-MM2

Where

m---> Molality

M----> Molarity

d----> density of solution in g/ml

M2---> Molar mass of solute (here is 23+16+1=40)

So m= 1000 * 2/1000*1.28 - 2*40

=2000/1200

= 5/3

=1.66667m

HOPE THIS HELPS YOU BUDDY!