What is the volume percent (v/v) of ethanol in a solution prepared by adding water to 15 mL of ethanol to give a final volume of 150 mL?

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To find the volume percent (v/v) of ethanol in the solution, you need to use the formula for volume percent, which is:

[

\text{Volume percent (v/v)} = \left( \frac{\text{Volume of solute}}{\text{Total volume of solution}} \right) \times 100

]

In this case, the volume of the solute, which is ethanol, is 15 mL. The total volume of the solution after adding water to the ethanol is 150 mL.

Now, plugging the values into the formula gives:

[

\text{Volume percent (v/v)} = \left( \frac{15, \text{mL}}{150, \text{mL}} \right) \times 100

]

Calculating this gives:

[

\text{Volume percent (v/v)} = \left( \frac{15}{150} \right) \times 100 = 0.1 \times 100 = 10.0%

]

Thus, the volume percent of ethanol in the solution is 10.0% (v/v). This calculation shows that the amount of ethanol relative to the total volume

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