lecture_2011_09_01b

lecture_2011_09_01b - Michigan State University College of...

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Harold Schock, Michigan State University Mixtures and Solutions Mixtures and Solutions Harold Schock Michigan State University Michigan State University College of Engineering College of Engineering Fall 2011 - ME444

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Harold Schock, Michigan State University The mole fraction y i of component i is defined as n i = no. of moles of i n = total moles in mixture Similarly mass fraction m i = mass of component i m = total mass in mixture n n y i i = m m mf i i = Mixtures of Ideal Gases Mixtures of Ideal Gases
Harold Schock, Michigan State University What Properties Can We Measure? What Properties Can We Measure? Mass Volume e Temperatur Pressure We could have tables to determine the properties of the mixture, but we would prefer to be able to derive properties from the pure substances that comprise the mixture.

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Harold Schock, Michigan State University One Exception: One Exception: Air tables which are based on the following composition: %MoleBasis Nitrogen 78.10 Oxygen 20.95 Argon 0.92 CO 2 +trace 0.03
Harold Schock, Michigan State University In general, properties of mixtures In general, properties of mixtures are defined as partial molal properties. are defined as partial molal properties. For example let’s examine the internal energy of the gases A + B shown above where denotes the partial molal internal energy. Similar equations can be developed for other properties. B B A A U n U n U + = mix U

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Harold Schock, Michigan State University Two models are used in conjunction with mixtures of gases, namely the Dalton Model Dalton Model and the Amagat Model Amagat Model . Dalton Model Dalton Model : Properties of each component are considered as each component existed separately at the volume and temperature of the mixture.
Harold Schock, Michigan State University Dalton Model Dalton Model Temperature = T Temperature = T Pressure = P A Pressure = P B Gas A Volume V Gas B Volume V

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Harold Schock, Michigan State University Ideal Gas Dalton Model
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This note was uploaded on 01/29/2012 for the course ME 444 taught by Professor Staff during the Fall '08 term at Michigan State University.

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lecture_2011_09_01b - Michigan State University College of...

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