Answer :
C. The concentrations of liquid water and water vapor are stable. it describes the fact that liquid water and water vapor are at equilibrium.
Equilibrium
- An equilibrium is achieved when no more water vapor can enter into the gas phase from the liquid water during evaporation process.
- This happens when a saturation is attained between liquid water and the vapor phase.
Hence, option (c) is correct. The concentration of liquid water and water vapor will become stable.
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