A vinegar titration was completed using a pH meter as an indicator of the changing pH. A 25.00 sample of diluted vinegar (diluted by a factor of 5) was placed in a beaker and subsequently titrated with 0.1098 M NaOH. A derivative curve of the titration suggested that the equivalence point occurred at 40.90 mL. Calculate the mass percent of CH3COOH ( the density of vinegar is 1.008 g/mL)