20. A solution of gold sol containing 50 mg / dm 3 Au i

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20. A solution of gold sol containing 50 mg / dm 3 Au is diluted in 1000
times and studied under an ultramicroscope. The total number of particles in the field of view with an area of 1⋅10-9 m 2 and a beam depth of 2,0⋅10-5 m is equal to 65. Assuming that the gold particles are spherical and have the same density as solid gold, ρ = 19,3⋅10 3 kg / m 3, calculate their average radius.

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Questions and problems from the manual:
"Laboratory Workshop on Colloid Chemistry" Nekrasov AP, Veretenchenko BA, Kharkov NTU "KhPI", 2004
"Characteristic properties of disperse systems" Nekrasov AP, Kharkov, 1996
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