9.20 Determine the half-coagulation time ϴ using experimental data on the coagulation of a gold sol with a sodium chloride solution. Is Smoluchowski's theory applicable to this case?
Coagulation time t, hour 0 0.5 1 2 3 5 9
Total number of particles in 1 m3 n*10-14 4.35 4.01 3.74 3.32 3.28 3.33 3.35

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