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A chemist pours 40 mL of ethanol into a flask and adds water until the solution measures 250 mL.

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A chemist pours $40\ \text{mL}$ of ethanol into a flask and adds water until the solution measures $250\ \text{mL}$ . What is the concentration of ethanol as a volume by volume percentage?

Need a reminder? The key ideaShow

Mass by mass $\% = \dfrac{\text{mass of solute}}{\text{mass of solution}} \times 100$ , where the solution is solute plus solvent. Volume by volume $\% = \dfrac{\text{volume of solute}}{\text{volume of solution}} \times 100$ .

The worked solution

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