Unformatted text preview: experimental value. 3. As we discussed in class the VdW equation can be written in term of reduced quantities P R = P / P c , V R = V / V c , T R = T / T C , as: P R + 3 V R 2 V R − 1 3 = 8 3 T R . (4) Verify by substituting eqs. (13) into (4) that this equation is the same as the normal VdW equation. 4. We discussed in class that the VdW constant b has the meaning of volume excluded by molecules. If we assume that molecules are spheres the volume taken by 1 molecule should be about d 3 , where d is the diameter of the molecule. Use the table value, b = 3.8 105 m 3 /mol, for Kr to estimate its diameter d . Does this number make sense?...
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 Spring '09
 Mole, Trigraph, Molecule, Van der Waals, der Waals equation

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