112. Solving a chemistry problem
In the study of the gold hydrosol by the Deryagin-Vlasenko flow ultramicroscopy, in a volume of 1.60 * 10-5 cm3, which passed through the counting field of the microscope, an average of 70 particles were found. Calculate the radius of the sol particles, knowing its concentration is 7.0 mg/m3 and the density of gold is 19.3 g/cm3.
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