Chemical equilibria are important in numerous biological and environmental processes. For example, equilibria involving O2 molecules and the protein hemoglobin play a crucial role in the transport and delivery of O2. When a liquid evaporates in a closed container, molecules with relatively higher kinetic energy escape the liquid surface into the vapor phase and the number of liquid molecules from the vapor phase strike the liquid surface and are retained in the liquid phase. It gives rise to a constant vapor pressure because of an equilibrium in which the number of molecules leaving the liquid equals the number returning to liquid from vapor. In this state we say that the system is in equilibrium. Chemical equilibrium is the state where the rate of forward reaction is equal to rate of backward reaction.
[A] [B]
Concentration of [A] is decreased to a value and the concentration of [B] is increased from 0 to the same value when this is attained chemical equilibrium takes place.
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