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Density of 2.05 M solution of acetic aci...

Density of `2.05 M` solution of acetic acid in water is `1.02g//mL`. The molality of same solution is:

A

`1.14 "mol kg"^(-1)`

B

`3.28 "mol kg"^(-1)`

C

`2.28 "mol kg"^(-1)`

D

`0.44 "mol kg"^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
C
Mass of 1 litre solution of 2.05 M acetic acid = 1020 g
Mass of acetic acid present in it `= 2.05 xx 60 = 123` g
Mass of solvent (water) in this solution = 1020 – 123 = 897 g
`:.` Molality of the solution `=(2.05)/897 xx1000 = "2.28 mol kg"^(-1)`
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