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.

real gases compression factor

Van der Waals Equation

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.