# If you have 20 mL of alcohol n a 100 mL solution what percent of concentration of the solution by volume?

Jun 6, 2014

The concentration of the solution is 20 % by volume.

Percent by volume = $\text{Volume of alcohol"/"Total volume of solution}$ × 100 %

Percent by volume = $\left(20 \text{mL")/(100"mL}\right)$ × 100 % = 20 %