Meteorology. The vapor pressure is the pressure of the vapor phase of a
substance when it is in equilibrium with the solid or liquid phase of the
substance. The relative humidity is the partial pressure of water vapor in the
air divided by the vapor pressure of water at that same temperature, expressed
as a percentage. The air is saturated when the humidity is 100\(\%\) (a) The
vapor pressure of water at \(20.0^{\circ} \mathrm{C}\) is \(2.34 \times 10^{3}\)
Pa. If the air temperature is \(20.0^{\circ} \mathrm{C}\) and the relative
humidity is \(60 \%,\) what is the partial pressure of water vapor in the
atmosphere (that is, the pressure due to water vapor alone)? (b) Under the
conditions of part (a), what is the mass of water in 1.00 \(\mathrm{m}^{3}\) of
air? (The molar mass of water is 18.0 \(\mathrm{g} / \mathrm{mol}\) . Assume
that water vapor can be treated as an ideal gas.)
