13. The study of rapid coagulation of kaolin suspension, carried out by counting particles using an ultramicroscope, gave the following results:
Coagulation time, s 0 105 180 255 335 420
Total number of particles in 1 m3 of sol, 10-14 5.0 3.90 3.18 2.92 2.52 2.00
Calculate the half-coagulation time from the given data.

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