
Interpretation:
The fact that the vapor pressure above liquid in a closed container is in equilibrium with liquid has to be explained. The way to recognise that the system has reached a state of equilibrium has to be shown.
Concept Introduction:
Equilibrium is the exact balance between two states; one state is the opposite of the other.

Answer to Problem 65A
The equilibrium takes place when evaporation rate becomes equal to condensation.
Explanation of Solution
The vapor pressure is developed above the liquid in the container. The molecules can transfer from the liquid phase to vapor phase. The number of gas molecules are increased they start to collide each other and some of the gas molecules condense to form a liquid. The equilibrium takes place when the rate of evaporation is equal to the rate of condensation.
Chapter 17 Solutions
World of Chemistry, 3rd edition
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