Lecture 5 (Thermodynamics(2)_Jan-27-2010_plus notes)

Lecture 5 (Thermodynamics(2)_Jan-27-2010_plus notes) -...

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Chapter 3 Partitioning: Molecular Interactions and Thermodynamics continued
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L i s i as i C C K , , , ‘s’ here refers to a surface, either Teflon or Quartz Consider and explain the observed trends? Molecule-Molecule Interactions Affecting Solid-Air Distribution Teflon is apolar so only vdW interactions possible Quartz is bipolar so specific interactions possible, thus allowing differentiation of adsorbing compound class
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Chapter 3 Outline • Introduction • Intermolecular Interactions • Quantifying molecular energies using thermodynamic functions • Fugacity • Activity coefficients • Chemical potential • Excess free energy, enthalpy & entropy • Quantifying phase partitioning using thermodynamic functions
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R elative E nergy Status ( R ES) = Energies • Energy status of molecules in a system (e.g. benzene in water) – Internal energies • chemical bonds, vibrations, flexations, rotations – External Energies • Whole molecule transitions, orientations • Interactions of molecule with surroundings • Energy status is a function of: – Temperature – Pressure – Chemical composition Average energy status per molecule Thermodynamics: Terms and Functions
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Chemical potential = free energy added to system with each added increment of i (in moles) j i i n P T n G , , Where = chemical potential kJ/mol) G = free energy (J) n i = moles of compound (i) n j = moles of compound (j) i i N i N n n n n T P G 1 , 2 1 ) .... , , , ( The total free energy ( G ) is the sum of the contributions from all the different components present: energy free molar partial mol J G i i ); / ( ) Change in G with each added increment of i @ constant everything else
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Lecture 5 (Thermodynamics(2)_Jan-27-2010_plus notes) -...

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