Question

What is the % (v/v) concentration of a 0.20 L sample of wine that contains 15 mL of ethyl alcohol?

a. 0.075%v/v
b. 7.0%v/v
c. 7.5%v/v
d. 0.070%v/v

Answer 1

The % v/v concentration of a 0.20 L sample of wine with 15 mL of ethyl alcohol is calculated to be 7.5% v/v. The correct answer to the student's question is c. 7.5% v/v.

Step-by-step explanation:

The percent volume/volume (% v/v) concentration is calculated by dividing the volume of the solute (in this case, ethyl alcohol) by the volume of the solution (the sample of wine), and then multiplying by 100 to get the percentage.

To find the % v/v concentration of a 0.20 L sample of wine containing 15 mL of ethyl alcohol, the calculation would be as follows:

(15 mL ethyl alcohol / 200 mL wine) × 100 = 7.5% v/v

Therefore, the correct answer is c. 7.5% v/v.