3. Westgren, observing the sedimentation equilibrium of part of the selenium hydrosol at 19 C, found that with a difference in level heights of 100 microns, there were 733 particles at one level and 444 at the other. The diameter of the selenium particles was 105.6 nm, the density was 4.27 g /cm3. What value of Avogadro´s number did Westgren obtain?
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