HW3_v2_KS_11_48_PM_16_Sept

HW3_v2_KS_11_48_PM_16_Sept - Chemical Engineering 150B-...

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1 Chemical Engineering 150B- Fall 2005 Problem Set #3 Due Wednesday September 21 st , 2005 Note: There are 3 problems in this assignment (see back of both pages). Problem 1. (15 points) A common procedure for increasing the moisture content of air is to bubble it through a column of water. The air bubbles are assumed to be spheres having a radius of 1 mm, and are in thermal equilibrium with the water at 298 K. Determine how long the bubble should remain in the water to achieve a vapor concentration at the center that is 90% of the maximum possible (saturation) concentration. Assume the air dry when it enters the column of water, and that the air inside the small bubble is very small. The vapor pressure of water is available from many sources, including the steam tables. Problem 2. (35 points) Liquid benzene leaked from a storage tank and seeped into the ground below. Since the density of benzene is less than the density of water, the liquid benzene formed a light nonaqueous-phase liquid layer on top of the water-saturated solid as shown: Dissolved benzene diffusion Nonporous rock layer Benzene storage tank Liquid benzene spill (on top of soil) 1m At a depth of 1 m below the water-saturated soil layer is a nonporous, impermeable rock layer. There is no ground water flow through the water-saturated solid layer; it is completely stagnant. Initially, there is no benzene dissolved in the water-saturated soil layer. Although water- saturated solid is a complex mixture, as a medium for benzene diffusion you may assume that it approximates the properties of a homogenous substance. The pure liquid benzene layer resting on top of the solid is essentially a constant source due to the low solubility of benzene in water.
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This homework help was uploaded on 04/02/2008 for the course CHEM 150b taught by Professor Bell during the Spring '08 term at Berkeley.

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HW3_v2_KS_11_48_PM_16_Sept - Chemical Engineering 150B-...

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