Property of mixture

Property of mixture - 1 CH6. The properties of mixtures The...

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Unformatted text preview: 1 CH6. The properties of mixtures The thermodynamic description of mixtures 6.1 Measures of concentration 6.2 Partial molar properties 6.3 Spontaneous mixing 6.4 Ideal solutions 6.5 Ideal-dilute solutions 6.6 Real solutions: activities (will learn in CH9:Electrochemistry) Colligative properties 6.7 The modification of boiling and freezing points 6.8 Osmosis Phase diagrams of mixtures 6.9 Mixtures of volatile liquids 6.10 Liquid–liquid phase diagrams 6.11 Liquid–solid phase diagrams Partial molar quantities • Partial molar volume : the contribution that a component of a mixture makes to the total volume of a sample • Example 1 : Assume a large volume of pure water at 25 o C and add 1 mol of H 2 O, the total volume increases by 18 cm 3 /mol ( V m of pure water ) • Example 2 : Assume a large volume of pure ethanol at 25 o C and add 1 mol of H 2 O, the total volume increases by 14 cm 3 /mol (partial molar V m of pure water in ethanol ) • Partial molar volume of a substance A in a mixture is the change in volume per mole of A added to a large volume of the mixture • It varies with composition because of the molecular environment (different type of forces acting among molecules) Total volume of the sample, V Molar volume V m B B A A m B B A A V x V x V V n V n V + = + = Partial molar volume Partial molar Gibbs energies • The chemical potential μ i is just another name for the molar Gibbs energy. • At constant T and p: d d d A A B B G n n = + + ⋅⋅⋅ μ μ ⋅ ⋅ ⋅ + + +- = B B A A d d d d d n n T S p V G μ μ The total Gibbs energy of a binary mixture G n n = + A A B B μ μ ' , , J J n T p n G = ∂ ∂ μ The TD of mixing • The dependence of the Gibbs energy of a mixture is given by...
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This note was uploaded on 02/04/2011 for the course CHEM 3050 taught by Professor Staff during the Spring '08 term at Kennesaw.

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Property of mixture - 1 CH6. The properties of mixtures The...

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