A sample of vinegar is 7.00 mass % acetic acid (60.052 g/mol) in water. What is the mole fraction of acetic acid in the vinegar sample? What is the molality of the vinegar sample?

• A. mole fraction of acetic acid = 0.0753
  molality of vinegar sample = 0.117 m
• B. mole fraction of acetic acid = 0.0221
  molality of vinegar sample = 1.25 m
• C. mole fraction of acetic acid = 0.0753
  molality of vinegar sample = 1.25 m
• D. mole fraction of acetic acid = 0.221
  molality of vinegar sample = 0.117 m

Answer: (B)