Question

The density of $4MNaOH$ solution is $1.6gm{L}^{-1}.$ The molality of the solution is

• A. 2.77
• B. 14.28
• C. 7.14
• D. 57.14

Answer 1

Answer: (A)

$m=\frac{1000M}{1000d-M{M}_B}=\frac{1000\times 4}{(1000\times 1.6)-(4\times 40)}$

$=\frac{4000}{1600-160}=\frac{4000}{1440}$

$=2.77molk{g}^{-1}$