The volume of acetic acid in a sample of 500mL of vinegar is determined to be 1mL. What is the v/v percentage of the vinegar?

Answer 1

What's the density of acetic acid?
mass = 1 mL x density (in g/mL)
That's the mass in 500 mL? 1/5 of that is the mass in 100 mL.

Answer 2

4.56