A Lower Tank Contains Water While an Upper Tank Contains

question 34

Multiple Choice

A lower tank contains water while an upper tank contains air with a negligible concentration of water vapor.A tube with a circular cross section and radius 0.050 m is inserted between the two tanks.The length of the tube is 0.25 m.The diffusion coefficient of water vapor through air is 2.4 × 10^-5 m²/s.The concentration of water vapor just above the surface of the water is 1.7 × 10^-2 kg/m³.If the water vapor is removed from the upper tank so that the concentration there remains nearly zero, what mass of water vapor diffuses through the tube each hour?

• A)4.6 × 10^-5 kg
• B)2.0 × 10^-6 kg
• C)7.1 × 10^-7 kg
• D)1.3 × 10^-8 kg
• E)8.2 × 10^-8 kg

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