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Real Gases

Problems

The van der Waals Equation

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Problem : 1.00 mol of ammonia fills a 7.00 liter bottle at 350 K. What does the van der Waals equation predict that the pressure will be? For ammonia a = 4.17  and b = 0.0371 L/mol .

Rearrange van der Waals equation to find pressure:


P = -  
  = -  
  = 4.04 atm  

Problem : How much volume would 1.00 mole of CH 4 molecules take up if they were stacked on each other? b CH4 = 0.04278 L/mol

Volume = nb . 1.00 mol×b CH4 = 0.04278  = 0.0428 L Keep in mind that, under ideal conditions, 1 mol of methane gas would occupy 22.4 L.

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