18. Vinegar is a solution formed by dissolving acetic acid (CH3COOH) in water. 42,5 ml 0,10 N NaOH solution was used to neutralize 5.50 g of vinegar sample. What is the percentage of acetic acid by mass in the vinegar. (CH3COOH: 60 g/mol)? 8.2 b) 5.896 4.6% d) 7.4% e) 3.5%