The normal boiling point of acetic acid is 117.9°C. Which of the following is true?
A) The vapor pressure of acetic acid at 100°C is greater than 760 torr.
B) The vapor pressure of acetic acid at 100°C is equal to 760 torr.
C) The vapor pressure of acetic acid at 100°C is less than 760 torr.
D) There is insufficient information to answer the question.

Question

Quizplus · Accepted Answer

The normal boiling point of acetic acid is 117.9°C, which means that at the boiling point, the vapor pressure of acetic acid is 1 atm or 760 torr. Since the boiling point is above 100°C, the vapor pressure of acetic acid at 100°C (which is below the boiling point) must be less than 760 torr. Therefore, the correct choice is C.

The Normal Boiling Point of Acetic Acid Is 117