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CHEM 433 – 9/21/11

CHEM 433 – 9/21/11. II. Gases B. “Real” (non-Ideal) Gases (1.3, 1.4) - Real gas Isotherms - The critical point - Quantifying non-ideal gases: - virial equation - van der Waals Equation. (1.4) READ: Finish Ch. #1 HW: Due F Exam #1 W next week – look at review sheet.

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CHEM 433 – 9/21/11

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  1. CHEM 433 – 9/21/11 II. Gases B. “Real” (non-Ideal) Gases (1.3, 1.4) - Real gas Isotherms - The critical point - Quantifying non-ideal gases: - virial equation - van der Waals Equation. (1.4) READ: Finish Ch. #1 HW: Due F Exam #1 W next week – look at review sheet

  2. Ideal gas “isotherms” P(V) = 1/V (T const)

  3. Real gas “isotherms” • ~Like ideal at high T - • then “not so much …” • P(V) = ??? T constant

  4. Isotherms: IDEAL (P~1/V) REAL (P~B/V+C/V2+D/V3…)

  5. There are other options as well.. http://en.wikipedia.org/wiki/Equation_of_state

  6. http://en.wikipedia.org/wiki/Van_der_Waals_constants_(data_page)http://en.wikipedia.org/wiki/Van_der_Waals_constants_(data_page)

  7. How would you expect a & b values to vary across the series: H2O, NH3, CH4? • a(Latm/mol2) b(10-2 L/mol) • CH4: 2.27 4.31 • NH3: 4.17 3.71 • OH2: 5.46 3.05

  8. vdW Isotherms …

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