Answer
250 mL of that solution contains 20.0 mL of ethanol.
Work Step by Step
1. Identify the conversion factors:
- Since the ethanol solution is 8.0% (v/v):
8.0 mL (Solute) = 100 mL (Solution)
So: $\frac{8.0 \space mL \space (Solute)}{100 \space mL \space (Solution)}$ and $\frac{100 \space mL \space (Solution)}{8.0 \space mL \space (Solute)}$
2. Calculate the volume of solution that contains 20.0 mL of ethanol:
$20.0 \space mL \space (Solute) \times \frac{100 \space mL \space (Solution)}{8.0 \space mL \space (Solute)} = 250 \space mL \space (Solution)$
