Which of the following is true concerning water vapor?
a. It is a true gas.
b. It has a constant pressure.
c. It exerts a partial pressure.
d. It exists above its critical temperature.
ANS: C
Water vapor exerts a pressure (PH2O) that results from the continuous, random movement of water molecules. It is not a true gas and does not have a constant pressure. As the temperature of a gas increases, water vapor pressure increases and water molecules leave the liquid state through evaporation.
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