Substance A contains stronger cohesive forces than substance B. Which of the following statements is true?
A) Substance A will have a higher boiling point and higher vapor pressure than substance B.
B) Substance A will have a lower boiling point and lower vapor pressure than substance B.
C) Substance A will have a lower boiling point and higher vapor pressure than substance B.
D) Substance A will have a higher boiling point and lower vapor pressure than substance B.
E) Substance A will have the same boiling point and vapor pressure as substance B.

Question

Quizplus · Accepted Answer

Stronger cohesive forces mean that it takes more energy to separate the molecules from one another, meaning substance A will have a higher boiling point than substance B. However, since the cohesive forces are stronger, it will be more difficult for the molecules of substance A to escape into the gas phase, resulting in a lower vapor pressure compared to substance B. Therefore, substance A will have a higher boiling point and lower vapor pressure than substance B.

Substance a Contains Stronger Cohesive Forces Than Substance B