significance of vander's waal radius 'a' and 'b' and its SI units
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The van der Waals equation of state approaches the ideal gas law PV=nRT as the values of these constants approach zero. The constant a provides a correction for the intermolecular forces. Constant b is a correction for finite molecular size and its value is the volume of one mole of the atoms or molecules.
The SI unit of vander waal's constant a is Nm^4 mol^-2.
The SI unit of b is m^3 mol^-1
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