Question #12f0d

1 Answer
Jul 23, 2017

Answer:

#%"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%#