4. The characteristic viscosity of a solution of polyvinyl alcohol in water at 50 C is 1.11 * 10 -3 m3 / mol. The average molar mass of the polymer in this solvent will be equal to (K - 6.04 * 10-5 (mol / m3), α - 0.67):
a) 1.9*104 g/mol;
b) 4.9*103 g/mol;
c) 7.4*104 g/mol.

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