# hw 4 - ChEn 2001 Homework#4 Due Monday October 5 2009...

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ChEn 2001, Homework #4 Due Monday, October 5, 2009 Problem 1. Consider a series of N dryers operating in series to remove the water from a wood product. The ﬁrst dryer removes 1/4 of the water originally in the wood, the second dryer removes 1/9 of the water originally in the wood, the third dryer removes 1/16 of the water originally in the wood and so forth. Make a plot of the total amount of water removed as a function of the number of dryers N for N = 1:10. If we had inﬁnitely many dryers, what fraction of the original water is removed? There are two options to solve this problem: (i) You can determine the exact result for this sum, probably with the help of a mathematical handbook. (ii) You can make a numerical calculation to large values of N . If you do method (ii), you must get the ﬁrst two signiﬁcant digits of the exact result. Problem 2 (Murphy 2.61). Natural gas usually contains some hydrogen sulﬁde (H 2 S), a very toxic and smelly gas. One way to remove H 2 S from sour natural gas is to pass the natural gas over

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## This note was uploaded on 10/30/2011 for the course CHEN 2001 taught by Professor Dorfman during the Fall '08 term at Minnesota.

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hw 4 - ChEn 2001 Homework#4 Due Monday October 5 2009...

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