Question

A solution is prepared by adding $2$ g of a substance A to $18$ g of water. Calculate the mass percent of the solute:

• A. 5%
• B. 10%
• C. 20%
• D. 30%

Answer 1

Answer: (B)

10%

Mass percent of solute = $\frac{massofsolute}{massofsolution}\times 100$

Mass of solute = 2 g

Mass of solvent = 18 g

Mass of solution = 20 g

$\therefore$ Mass percent of solute $=\frac{2}{20}\times 100$

$=10\text{\%}$

Hence, option $B$ is correct.