Question #12208

1 Answer
Stefan V.
Apr 13, 2017

#"8.19% v/v"#

Explanation:

A solution's volume by volume percent concentration, #"v/v %"#, tells you the number of milliliters of solute present in #"100 mL"# of solution.

You already know the number of milliliters present in #"359 mL"# of solution, so all that you need to do here is to use the known composition of the solution as a conversion factor to figure out how many milliliters of ethanol would be present in #"100 mL"# of solution.

Keep in mind that you can do this because solutions are homogeneous mixtures, i.e. they same the same composition throughout.

You will have

#100 color(red)(cancel(color(black)("mL solution"))) * "29.4 mL ethanol"/(359color(red)(cancel(color(black)("mL solution")))) = "8.19 mL ethanol"#

This means that the solution's volume by volume percent concentration is equal to

#color(darkgreen)(ul(color(black)("% v/v = 8.19% ethanol")))#

The answer is rounded to three sig figs.

Related questions
See all questions in Percent Concentration
Impact of this question
2290 views around the world
You can reuse this answer
Creative Commons License