When a liquid is in dynamic equilibrium with its vapor at a given temperature,the following conditions could exist:
I.There is no transfer of molecules between liquid and vapor.
II.The vapor pressure has a unique value.
III.The opposing processes, (liquid to vapor)and (vapor to liquid),proceed at equal rates.
IV.The concentration of vapor is dependent on time.
Which of the above choices are applicable?
A)I
B)II and III
C)I,II,and III
D)II and IV
E)II,III and IV

Question

Quizplus · Accepted Answer

In a dynamic equilibrium between a liquid and its vapor, the vapor pressure is constant (II) and the rates of evaporation and condensation are equal (III). There is a continuous transfer of molecules between the phases, so (I) is incorrect, and the concentration of vapor remains constant over time, making (IV) incorrect.

When a Liquid Is in Dynamic Equilibrium with Its Vapor