Question #12f0d

1 Answer
Nathan L.
Jul 23, 2017

%"v/v" = 25%

Explanation:

We're asked to find the percentage by volume of alcohol in a solution.

We're given:

  • 100 "mL alcohol"

  • 300 "mL H"_2"O"

The total volume of the solution is

100 "mL alcohol" + 300 "mL H"_2"O" = color(red)(400 color(red)("mL soln"

The volume percent of the alcohol is thus

%"v/v" = "vol. alcohol"/"vol. soln" xx 100% = (100cancel("mL"))/(color(red)(400)cancel(color(red)("mL"))) xx 100% = color(blue)(25%

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