913. Calculate the molar mass of polyvinyl acetate in acetone, using the data of the viscometric method (the constants of the Mark-Houwink equation Kmn = 4.2 × 10-5 l / g, α = 0.86):
Solution concentration, kg/m3 1.0 3.0 5.0 7.0
Specific viscosity of the solution 0.14 0.465 0.84 1.3
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