Question

20 $c{m}^3$ of an alcohol is dissolved in 80 $c{m}^3$ of water. Calculate the percentage by volume of alcohol in solution

• A. 10 %
• B. 15 %
• C. 30 %
• D. 20 %

Answer 1

The correct option is D 20 %

Given: Volume of alcohol = 20 $c{m}^3$
Volume of water = 80 $c{m}^3$
$\%v/v$ of alcohol = $\frac{\text{volume of the component (mL)}}{\text{volume of the solution (mL)}}\times 100$
$\%v/v=\frac{\text{2}0}{\text{2}0+80}\times 100=20$ %