The volume of a 85% (v/v) rubbing alcohol solution that contains 15 ml of alcohol is approximately 17.65 ml.
Percentage by volume is a measure of concentration that indicates the volume of solute per 100 volume units of the solution. In other words, the volume percent of a component in the solution is defined as the ratio of the volume of the component to the volume of the solution, expressed as a percentage.
% (v/v) = (volume of solute / volume of solution) x 100
Substitute the given information to the equation.
% (v/v) = 85%
volume of solute = 15 ml
% (v/v) = (volume of solute / volume of solution) x 100
85% = (15 ml / volume of solution) x 100
volume of solution = 300/17 ≅ 17.65 ml
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