Question

When a liquid is in dynamic equilibrium with its vapour at a given temperature, t, which of the following statements are true?

a) the vapour pressure has a unique value at a given temperature.
b) the system is not beyond the supercritical point.
c) increasing temperature will decrease vapour pressure.
d) the liquid and vapour cannot be in equilibrium with the solid phase.

Answer 1

In dynamic equilibrium between a liquid and its vapor, the vapor pressure has a unique value at a given temperature, and increasing the temperature increases the vapor pressure. The liquid and vapor can be in equilibrium with the solid phase. The option (A) is correct.

Step-by-step explanation:

When a liquid is in dynamic equilibrium with its vapor at a given temperature, the vapor pressure has a unique value at that temperature. This means that the vapor pressure remains constant as long as the temperature is constant.

In this state of dynamic equilibrium, the liquid and vapor are in balance, and the rate of vaporization of the liquid equals the rate of condensation of the vapor. Increasing the temperature will increase the vapor pressure, not decrease it. The liquid and vapor can be in equilibrium with the solid phase, as long as the conditions for equilibrium are met. Therefore, option (A) is correct.