What is the percent by volume of ethanol in a solution that contains 20. mL of ethanol dissolved in 137 mL of water?

12.7% v/v

Explanation:

The percent by volume (% v/v) expresses the volume of solute dissolved in 100 mL of solution. It can be calculated as follows:

%v/v = volume of solute/volume of solution x 100%

In this problem, the solute is ethanol and the solvent is water. Thus, we have the following data:

volume of solute = 20 mL (ethanol)

volume of solution = volume of solute + volume of solvent = 20 mL + 137 mL = 157 mL

Finally, we introduce the data in the equation:

%v/v = 20 mL/157 mL x 100% = 12.7% v/v

false

because it does not have the potential to be entirely used up