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Homework 5 Thermo - V and other properties of the mixture...

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Homework 5 Thermo ll Fall 2010 Due:10/20 2010 in class. These are relatively short, but you will think a bit. 1. In Eqn 9.2-3a, there are three equivalent definitions of the fugacity of a component in a mixture. Show how the last (i.e. the third version) can be derived from the first. While the first and third forms compute the same number, what is the difference between what the equations say? In other words, from the physical standpoint, why do both make sense? 2. A Fe 2+ iron solution is mixed with a porphoryin solution. The iron and porphoryin combine 1:1 to form a chelate-like complex akin to that found on hemoglobin. Is S EX zero or nonzero, and if nonzero, what is its sign? Why? 3. Two gases, 1 and 2, are combined in a mixture, and the mole fraction of each gas is equal. When the VDW EOS is used to predict
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Unformatted text preview: V and other properties of the mixture, some approximate (there are better) mixing rules are b mix = ½ (b 1 + b 2 ) = Σ x i b i a 12 = (a 11 a 22 ) ½ Based on these mixing rules, while binary pair from below is least likely to form an ideal mixture, and why? Species a (Pa m 6 mol-2 ) b (m 3 /mol 10 5 ) X 0.6 1.3 Y 0.01 10.9 Z 0.8 1.6 4. The excess Gibbs Energy per mole is measured for a binary mixture. The value is found to be independent of composition and also equal to a nonzero constant, a . The researchers are scratching their heads. They hypothesize that the measurement could be (i) real or (ii) a result of a systematic measurement error. Is hypothesis (i) valid? (Man…is this a great, practical, albeit simple question!)...
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