18. When measuring the viscosity of solutions of polymethyl methacrylate in benzene, the following data were obtained:
Solution concentration с, kg/m3 0 1.0 1.2 1.4 1.6 1.8 2.0
Expiration time t, s 190.5 268.3 285.6 303.8 322.6 341.9 362.8
Build a graph in the coordinates nsp/s-s and determine from it the value of the intrinsic viscosity [n] and the viscometric constant K in the Mark-Houwink equation is 9.60 * 10-3, and the constant a = 0.77.

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