Lecture Notes for CHEM 3410 - PHYSICAL CHEMISTRY I with Richard at The Richard Stockton College of New Jersey (StoCo)

Notes Information

Material Type:Class Note
University:The Richard Stockton College of New Jersey
Term:Fall 2008
  • Free Energy
  • Natural Sciences
  • Temperature
  • Stable Equilibrium
  • Following Di
  • Binary System
  • Interactions
  • Phase Diagram
  • Composition
  • Enthalpy Change
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The Richard Stockton College of New Jersey Chemistry Program, School of Natural Sciences and Mathematics PO Box 195, Pomoma, NJ CHEM 3410: Physical Chemistry I | Fall 2008 October 27, 2008 Lecture 24: Binary phase diagrams References 1. Levine, Physical Chemistry, Sections 9.1, 9.3, 9.5{9.6 Key Concepts For an ideal, binary solution the free energy of mixing can be written as: Gmixed = XA A +XB B = XA A +XB B +RT(XA lnXA +XB lnXB) The change in free energy upon mixing is given by: Gmixing = Gmixed Gumixed = RT(XA lnXA +XB lnXB) For an ideal solution, this free energy change will always be negative meaning that two ideal components will always mix in all compositions. We can understand this mixing by considering the enthalpy and entropy of mixing. The entropy of mixing is: Smix = @ G mix @T = R(XA lnXA +XB lnXB) The entropy of mixing of two ideal components is always positive, which agree with the previous case we considered for just ideal gases. The enthalpy of mixing can...

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