A 250 .- mL bottle of mouthwash contains 19. mL of ethanol. What is the volume/volume percent concentration of ethanol? Be sure your answer has the correct number of significant figures.

Answer 1

The volume/volume percent concentration of ethanol can be calculated using the formula:

(volume of ethanol / total volume of solution) x 100%

Plugging in the values we have:

(19 mL / 250 mL) x 100% = 7.6%

Therefore, the volume/volume percent concentration of ethanol in the mouthwash is 7.6%.