Answers

2014-04-23T18:53:10+05:30
First correction is 
          P = RT / (Vm - b)
      b = 4*vm*Na         (vm = Volume of a single molecule)
  vm = 4*Pi*r^3 / 3
the molecule as simple spheres suggests that (at low density) the excluded volume is 4 times the actual volume.
second correction is 
P = RT / (Vm - b) - a / Vm^2 
a = bRTb
Tb = boyle temperature

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