7. Calculate the change in the number of secondary particles over time for a gold sol during its coagulation in the following time intervals: 60, 120, 240, 480 and 600 s. The initial number of particles in 1 m3 is n0 = 2.5*1014 particles. The half-coagulation time is 290 s. Plot a curve of the change in the number of secondary particles of the gold sol in the coordinates n=f(t).

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