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Show that for a gas of rigid spherical molecules, b in the van der Waals equation...

Show that for a gas of rigid spherical molecules, b in the van der Waals equation is four times the molecular volume times Avogadro's constant. If the molecular diameter of Ne is 0.258 nm (2.97*10^-5 kg/ms or 4.6*10^-2 J/Kms), approximately what value of b is expected?

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