10.4 Real Gases & the Van der Waals Equation
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Real Gases
Real gases experience attractive forces.
For real gases, the molecules have volume.
Van der Waals Equation
+an2 / V2 corrects for attractive forces
-nb corrects for repulsive forces (as molecules do have volume)
| Van der Waals Constants | ||
|---|---|---|
a  | b  | |
| H2 | 0.244 | 0.0266 |
| N2 | 1.39 | 0.0391 |
| CH4 | 2.25 | 0.0428 |
1 mole of CH4 at a temperature of 100K has a volume of 8.2L.
Calculate its pressure if it is behaving ideally.
Calculate its pressure using the Van der Waals equation.
1 mole of CH4 at a temperature of 100K has a volume of 0.50L.
Calculate its pressure if it is behaving ideally.
Calculate its pressure using the Van der Waals equation.