Question

0.5 g of a substance is dissolved in 25 g of a solvent. Calculate the amount of the substance in % w/w in the solution.

• A. 5.34 %
• B. 2.00 %
• C. 1.96 %
• D. 2.92 %

Answer 1

The correct option is C 1.96 %

Given: mass of substance = 0.5 g
Mass of solvent = 25 g
$\%\frac{w}{w}=\frac{\text{weight of the component in solution (g)}}{\text{total weight of the solution (g)}}\times 100$
$\%\frac{w}{w}=\frac{\text{0.5}}{\text{0.5+25}}\times 100=1.96\%$