4 - Heats of Mixing (Solution)_S10-1

4 - Heats of Mixing (Solution)_S10-1 - Heats of Mixing...

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Copyright 2010 D.B. Dadyburjor and J. A. Shaeiwitz Heats of Mixing (Solution) ChE 202 Spring 2010
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Copyright 2010 D.B. Dadyburjor and J. A. Shaeiwitz Retrospective – Sub-processes considered 9 Change in pressure at constant temperature 9 Change in temperature at constant pressure 9 Change in T or P at constant volume 9 Change in phase at constant P and T 9 Change in phase + mixing (DA + w) Î Mixing of pure components to multicomponent system at constant T and P (and reverse) Î Pure components in stoichiometric amounts reacting to form pure products(s)
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Copyright 2010 D.B. Dadyburjor and J. A. Shaeiwitz Now … 9 Change in pressure at constant temperature 9 Change in temperature at constant pressure 9 Change in T or P at constant volume 9 Change in phase at constant P and T 9 Change in phase + mixing DA + w Î Mixing Simplest -- pure components to multicomponent system at constant T and P (and reverse) ± Pure components in stoichiometric amounts reacting to form pure products(s)
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Copyright 2010 D.B. Dadyburjor and J. A. Shaeiwitz When is it Important? Why? ± Mostly acids, bases in water ± most significant heat effects ± Any time gas dissolves (not condenses) into liquid ± When some solids dissolve in liquids ± Reason: Rearrangement of solvent molecules for solvation may require (or may release) energy (heat) to maintain T sys
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Copyright 2010 D.B. Dadyburjor and J. A. Shaeiwitz
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4 - Heats of Mixing (Solution)_S10-1 - Heats of Mixing...

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