Chem

In the van der waals equation, the constants a and b are:

1)used to correct for the finite volume of gas molecules and the attractive forces between molecules
2)equal to each other for any real gas
3)used to correct for the difference between Celcius and Kelvin
4)equal to 1 for ideal gases
5)used to correct for the fact that collisions of gas molecules are not really completely elastic.

I was thinking 4, but could someone confirm?

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  1. Certainly not equal to one for ideal gases.

    http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/waal.html

    What is wrong with number one?

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