Question

A solution contains 30 g of sugar in 360 g of water. If 10 g more sugar is added to the solution, then the concentration (w/w)% of the solution will be

• A. 7.7%
• B. 10%
• C. 2.30%
• D. 11%

Answer 1

The correct option is B 10%

Mass of solute = 30 + 10 = 40 g
Mass of solution = Mass of solute + Mass of solvent
= 40 + 360
= 400 g
Concentration (w/w)% of solution $=\frac{\text{Mass of solute}}{\text{Mass of solution}}\times 100$
$=\frac{40}{400}\times 100$
$=10$%
Hence, the correct answer is option (b).