A Food Chemist Determined the Concentration of Acetic Acid in a Sample

Short Answer

A food chemist determined the concentration of acetic acid in a sample of apple cider vinegar. The density of the sample was 1.01 g/mL. The volume of 1.215 M NaOH required to titrate a 25.00 mL sample of the vinegar was 19.85 mL. What is
(a) the molar concentration, and
(b) the percent by mass of acetic acid in this vinegar? (CH₃COOH, 60.05 g/mol)