A 16.8 mL sample of vinegar, containing acetic acid, was titrated using 0.404 M NaOH solution. The titration required 23.83 mL of the base. What was the molar concentration of acetic acid in the vinegar? Assuming the density of the vinegar is 1.01 g/mL, what was the percent (by mass) of acetic acid in the vinegar?