Question

use the observation in the first column to answer the question in the second column.
observation\tquestion
the enthalpy of vaporization of substance e is smaller than that of substance f.\twhich has the higher boiling point? substance e substance f neither, e and f have the same boiling point. its impossible to know without more information.
at 22 °c, substance a has a vapor pressure of 84. torr and substance b has a vapor pressure of 134. torr.\twhich has a higher enthalpy of vaporization? substance a substance b neither, a and b have the same enthalpy of vaporization. its impossible to know without more information.
at 1 atm pressure, substance c boils at 3. °c and substance d boils at 22. °c.\twhich has a higher vapor pressure? substance c substance d neither, c and d have the same vapor pressure. its impossible to know without more information.

Explanation:

Step1: Understand the relationship between enthalpy of vaporization and boiling point

Higher enthalpy of vaporization means more energy is needed to convert a liquid to a gas, so higher boiling - point. Since the enthalpy of vaporization of Substance E is smaller than that of Substance F, Substance F has a higher boiling point.

Step2: Understand the relationship between vapor pressure and enthalpy of vaporization

Lower vapor pressure at a given temperature means stronger intermolecular forces and higher enthalpy of vaporization. Substance A has a lower vapor pressure (84 torr) than Substance B (134 torr) at 22°C, so Substance A has a higher enthalpy of vaporization.

Step3: Understand the relationship between boiling point and vapor pressure

Lower boiling - point substances have higher vapor pressures at the same external pressure. Substance C boils at 3°C and Substance D boils at 22°C at 1 atm. So Substance C has a higher vapor pressure.

Answer:

Substance F
Substance A
Substance C