Suppose you have two colorless molecular liquids, one boil- ing at - 84 °C, the other at 34 °C, and both at atmospheric 6 pressure. Which of the following statements is correct? For each statement that is not correct, modify the statement so that it is correct. (d) The two liquids have iden- tical vapor pressures at their normal boiling points.

Key Concepts

Boiling Point

The boiling point of a liquid is the temperature at which its vapor pressure equals the external pressure surrounding the liquid. At this point, the liquid transitions to a gas. In this question, the two liquids have different boiling points, indicating that they have different vapor pressures at a given temperature.

Vapor Pressure

Vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid or solid phase at a given temperature. It reflects the tendency of particles to escape from the liquid phase into the vapor phase. The statement in the question suggests that both liquids have identical vapor pressures at their boiling points, which is incorrect due to their differing boiling temperatures.

Normal Boiling Point

The normal boiling point of a substance is defined as the temperature at which it boils under standard atmospheric pressure (1 atm). It is a characteristic property of a substance and varies based on intermolecular forces. Since the two liquids have different normal boiling points, they cannot have identical vapor pressures at those points.