Question

If you have 100.0ml of a 30.0% aqueous solution of ethanol, what volume of ethanol is in the solution?

Answer 1

Answer:

30 ml

Explanation:

• Assuming that solution is only composed of water and ethanol, we must know that solution is (100% - 30% = 70%) water by volume. To determine the volume of water multiply volume of solution by volume of the percentage of water.
• V(water) = 70% x 100ml = 70 ml
• V(ethanol)  = V(solution) - V(water) = 100ml - 70ml = 30ml

Answer 2

Considering the definition of volume percentage, the volume of ethanol in the solution is 30 mL.

Volume Percentage 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.

The volume percentage of a solution is determined by the following expression:

$volume percentage=\frac{volume of solute}{volume of solution} x100$

In this case, you know:

• volume percentage= 30 %
• volume of solute= ?
• volume of solution= 100 mL

Replacing:

$30=\frac{volume of solute}{100 mL} x100$

Solving:

30 mL= volume of solute

Finally, the volume of ethanol in the solution is 30 mL.

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