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

Question

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

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Gia Bảo 2 months 2021-07-30T16:32:34+00:00 1 Answers 4 views 0

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    2021-07-30T16:34:00+00:00

    Answer:

    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

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