ChE+230+HW+7+solutions

ChE+230+HW+7+solutions - 1 Problem 3 You place a bottle...

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2 Problem 3. You place a bottle containing an aqueous solution of ammonia at 30% molal concentration in your pocket. (Not a smart idea.) The solution warms up to body temperature (98.6°F). Using the table at the end of the homework (after the ASPEN problem), answer the following questions: a. What is the vapor pressure of the solution? b. If you open the lid, will it boil? a) Extrapolate the tabulated data to calculate vapor pressure at 98.6 ° F, 30% molal using equation: ࠵? ࠵? ! = ! ! ! ! ! ! ! ! ! ! ࠵? ࠵? ! , thus ࠵? !"# , !" . ! ! , !"% !"#\$# = !" . !" ! !" . !" !"" ! !" 98 . 6 90 + 17 . 23 = 20 . 75 ࠵?࠵?࠵?࠵? b) Once the lid is opened, the pressure becomes atmospheric (= 14.7 psia, which is < than the solution’s vapor pressure). The solution will thus boil.
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5 Problem 5. ASPEN The fresh feed in an ammonia production process contains nitrogen and hydrogen in stoichiometric proportion, along with an inert gas (argon). The feed is combined with a recycle stream containing the same three species, and the combined stream is fed to a reactor in which a low single-pass conversion of nitrogen is achieved. The reactor effluent flows to a condenser. A liquid stream containing

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