Final answer:
The concentration of the solution after mixing 60.0 mL ethanol with 240.0 mL water is 20.0% ethanol by volume.
Step-by-step explanation:
The question asks to determine the concentration of a solution in volume percent after mixing 60.0 mL ethanol with 240.0 mL water.
Volume percent (volume percent) is a common unit of concentration that expresses the volume of the solute (in this case, ethanol) divided by the total volume of the solution, multiplied by 100. To find the volume percent of ethanol in the solution, you use the following calculation:
volume percent
= (volume of solute / volume of solution) * 100
Here, the volume of the solute (ethanol) is 60.0 mL and the total volume of the solution is 60.0 mL (ethanol) + 240.0 mL (water) = 300.0 mL. Plugging these numbers into the formula gives us:
volume percent = (60.0 mL / 300.0 mL) * 100 =
20.0%
Therefore, the ethanol concentration in the solution is 20.0% by volume.