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1.13. Assuming that in a colloidal solution of gold eac
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1.13. Assuming that in a colloidal solution of gold each particle is a cube with an edge length of 2 · 10– m, calculate: a) the number of particles per 1 g of gold sol; b) the total surface area of the gold particles. The density of gold is 19.6 · 10 kg / m3.