146. Solving a chemistry problem

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6 In the study of the gold hydrosol using an ultramicroscope in the volume W = 12⋅10-19 m3, 5 spherical particles were counted. Calculate their average radius, if the concentration of sol C = 30 10-2 kg / m3; the density of gold is ρ = 19.3⋅103 g / m3.

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