Taking into account the definition of Volume to Volume Percentage (% V/V), 61.3548 mL of isopropanol are in a 89.7 mL sample of the rubbing alcohol solution.
Volume to Volume Percentage (% V/V) is a measure of concentration that indicates the volume of solute per 100 volume units of solution.
In other words, the percentage %v/v indicates the volume of solute (in mL) that is dissolved in 100 mL of solution.
The %v/v of a solution is determined by the following expression, which is multiplied by 100 to express it as a percentage:
[tex]v/v=\frac{volume of solute (mL)}{volume of solution(mL)} x100[/tex]
In this case, you know:
Replacing in the definition of %v/v:
[tex]68.4=\frac{volume of solute (mL)}{89.7 mL} x100[/tex]
Solving:
volume of solute= (68.4× 89.7 mL)÷ 100
volume of solute= 61.3548 mL
Finally, 61.3548 mL of isopropanol are in a 89.7 mL sample of the rubbing alcohol solution.
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