913. Calculate the molar mass of polyvinyl acetate in acetone, using the data of the viscosimetric method (the constants of the Makrk-Houwink equation Kmn = 4.2 * 10-5 l / g, a = 0.68):
Solution concentration, kg/m3
Specific viscosity of the solution 0.14 0.465 0.84 1.3

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