# Question 48506

May 25, 2017

(b) 30%

#### Explanation:

We're asked to find the percent by volume of ethanol in a $500 \text{mL}$ solution containing $150 \text{mL}$ of ethanol.

To find the percent by volume of a component, you divide the volume of the component by the total volume, and multiply by $100$:

% = (V_"ethanol")/(V_"total") xx 100%

Thus, the percent by volume of ethanol in this solution is

(150 cancel("mL"))/(500cancel( "mL")) xx 100% = color(red)(30%#