Some people have begun to formulate their own window-cleaning solutions using commonly available household chemicals. One formulation calls for mixing vinegar (dilute acetic acid, HC2H3O2) with water and a small amount of detergent. A commonly used recipe contains 12.8 g of acetic acid mixed with 333 g of water and 2.7 g of detergent. This recipe makes a total of 349 mL of solution. Required:
a. What is the mass percent of acetic acid in the window cleaner?
b. What is the molarity of acetic acid in the window cleaner?