ps_9 - 10.302 Fall 2004 Homework Problem Set 9 Due...

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10.302 Fall 2004 Homework Problem Set 9 Due Wednesday, November 24, at start of class Part A 1. Consider an iron surface which serves as a catalyst for the production of ammonia from nitrogen and hydrogen. The temperature is 500 ° C. The pressure is 100 atm (10 x 10 6 Pa ). The rate of ammonia production is 0.02 kg /m 2 s. At the surface of the catalyst, it is believed that the mole fractions of N 2 , H 2 , and NH 3 are 0.10, 0.40, and 0.50 respectively. What are the corresponding mass fractions for N 2 , H 2 , and NH 3 ? What is the mass average velocity? What is the mole average velocity? Notes: Despite the high pressure, it is permissible for this purpose to use the ideal gas laws. N 2 IRON H 2 NH 2 2. Problem 14.16 of I&D, but, in addition, a. Sketch the Helium concentration profile from the interior of the tube, through the glass cylinder, and into the ambient. b. If the tube contained Helium at a partial pressure of 4 bar, but another gas was also present, would the answer be different? What role might be played by mass transfer coefficients?
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3. A test tube contains methanol at 50 ° C, at which condition methanol has a vapor pressure of 400mm Hg. Air, also at 50 ° C, is gently blown across the top of the test tube. Initially, the liquid level is 2cm below the top of the tube. Use a quasi-steady analysis to estimate the time required for the liquid level to drop by 2cm. Please show whether or not the quasi-steady assumption is valid. Data:
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ps_9 - 10.302 Fall 2004 Homework Problem Set 9 Due...

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