Question

Water is evaporating into initially dry air in the closed
cylindrical vessel. The inside diameter of the vessel is 10 cm and
the height is 20 cm. The vessel is isothermal at 25^{o}C
and the vapor pressure of water is 23.8 mmHg. This vessel has 500
cm^{3} of water. The rate of transfer of water from the
liquid to the gas per unit area of gas-liquid interface is given by
the expression rw(mol/cm2.s) = k(C*w - Cw) where

Cw(mol/cm3) = actual concentration of water vapor in the air.

C*w(mol/cm3) = concentration of water vapor in the air that would be in equilibrium with the liquid phase.

If k = 0.034 cm/sec how long will it take for the air to reach 90% saturation (equilibrium)?

Answer #1

Benzene is evaporating into a closed, well-mixed 20-L vessel.
Assume the surface area of the Benzene is 150 cm2 . Benzene has a
molecular weight of 78 g/mol, liquid density of 0.88 g/mL, vapor
pressure of 0.125 atm., liquid activity coefficient of 2400 (25 °C
and 1 atm), solubility of 1780 mg/L and an octanol-water
coefficient of log KBow=2.0 (mass concentration basis).
a) How much chemical (grams) would have to be added to reach a
benzene concentration of 200 mg/L...

The next three questions go together. 21. Expired air is
saturated with water vapor and generally contains more of it than
does inspired air. There is usually a net loss of water from the
body due to breathing. Water vapor pressure in the at saturation in
the lungs (at 37°C) is 47 mmHg, while in expired air at 33°C it is
37.7 mmHg. Consider the case of someone who is breathing dry air in
and moist air out at a...

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