Question

The density of the solution of a salt X is 1.15 g $m{L}^{-1}$. 20 mL of the solution when completely evaporated gave a residue of 4.6 g of the salt. Calculate the mass percentage of the solute in solution.

• A. $5\%$
• B. $10\%$
• C. $15\%$
• D. $20\%$

Answer 1

The correct option is D $20\%$

Mass of solution = 20 x 1.15 =23 g

% of solute in solution = $\frac{4.6}{23}\times$ 100 =20%