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Humid air is enclosed in a 2.00-liter flask at 40e. The

Elementary Principles of Chemical Processes | 3rd Edition | ISBN: 9780471687573 | Authors: Richard M Felder ISBN: 9780471687573 143

Solution for problem 8.72 Chapter 8

Elementary Principles of Chemical Processes | 3rd Edition

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Elementary Principles of Chemical Processes | 3rd Edition | ISBN: 9780471687573 | Authors: Richard M Felder

Elementary Principles of Chemical Processes | 3rd Edition

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Problem 8.72

Humid air is enclosed in a 2.00-liter flask at 40e. The flask is slowly cooled. When the temperature reaches 20o e, drops of moisture become visible on the flask walL Although the pressure in the flask changes when the temperature drops, it remains close enough to 1 atm for the psychrometric chart 431 Encyclopedia Equipment dryer Encyclopedia Equipment condenser, heat exchanger to provide a close representation of the behavior of the system throughout the process. Use the chart to solve the following problems. (a) What were the relative humidity, absolute humidity, and wet-bulb temperature of the air at 40C? (b) Calculate the mass of the water in the flask. (See Example 8.4-5.) (c) Calculate the enthalpy change in joules undergone by the air in going from 40C to 20e. (d) Write an energy balance for this closed-system process, taking the wet air in the flask as the system, and use it to calculate the heat in joules that must be transferred from the air to accomplish the cooling. (Assume ideal gas behavior, so that H = 0 + RT.)

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Textbook: Elementary Principles of Chemical Processes
Edition: 3
Author: Richard M Felder
ISBN: 9780471687573

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Humid air is enclosed in a 2.00-liter flask at 40e. The