12. In the study of the gold hydrosol by ultramicroscopy, 70 particles were counted in a flow in the volume W = 1.6 × 10 -11 m 3. Determine the average
radius of the spherical particles of the sol, if the weight concentration of the sol is C = 7⋅10 -7 kg / m3; density ρ = 19.3⋅10 3 kg / m 3.
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