Question

A solution of 2% (by mass) sodium chloride is prepared. The molality of this solution is:

• A. $0.483$
• B. $0.393$
• C. $0.349$
• D. $0.750$

Answer 1

Answer: (C)

$0.349$

2%( by mass) means 2 gm solute in 100 gm solution i.e. 98 gm of solvent.

molality $=\frac{2}{58.5}\times \frac{1000}{98}$

$=0.349$

Option C is correct.