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Step 1 : Is the gas ideal or non-ideal? (Page 192)PowerPoint Presentation

Step 1 : Is the gas ideal or non-ideal? (Page 192)

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Step 1 : Is the gas ideal or non-ideal? (Page 192)

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Non-Ideal Gases: How do you relate P, V, T?

Non-ideal if:

Step 1: Is the gas ideal or non-ideal? (Page 192)

If ideal, use PV = nRT

- Step 2: Non-ideal? Choose an approach
- Equation of State
- Compressibility Factor

- Equations of State give analytic solutions
- There are several EOS to choose from
- SRK explained on p. 203
- “plug and chug” to solve Eqn 5.3-7 below

- Compressibility factor “Z”
- PV = znRT (z is “fudge factor”)
- Calculate (2 of 3) Pr, Tr, Vr
- Plots on p. 208-210
- Find where Pr, Vr, or Tr intersect and read Z

PV = znRT

Notes: 1. Non-ideal gases use “reduced” values for P, T, V so that “universal” equations and plots can be used. Otherwise, every gas (e.g., nitrogen, propane, etc) would have different plots and equations relating P, T, V.

2. is the molar volume = volume divided by the moles (vol/mol)

3. Kay’s Rule: If you have more than one component, the “pseudocritical” T and P are “weighted” by their mole fractions (pg. 211)