The equilibrium between water and its vapor, in an open vessel
Correct answer: B. cannot be achieved
- A. can be achieved
- B. cannot be achieved
- C. depends upon pressure
- D. depends upon temperature
Explanation
The equilibrium between water and its vapor in an open vessel cannot be achieved because the water molecules continuously escape into the air as water vapor, while water vapor molecules continuously condense back into the liquid water. This means that the concentrations of water and water vapor are constantly changing, and the system is not able to reach a state of equilibrium. In an open vessel, the water vapor can escape into the air, which means that the concentration of water vapor will not build up to the point where the rate of condensation equals the rate of evaporation. As a result, the system will not be able to reach equilibrium.
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About Chemical Equilibrium
Reversible reactions reach dynamic equilibrium when forward and reverse rates become equal, and Le Chatelier's principle predicts the effect of changing concentration, pressure or temperature. The chapter also covers solubility product, the common ion effect, buffer action and the conditions used in Haber's process, with equilibrium shifts distinguished from changes in the equilibrium constant.
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