4. The characteristic viscosity of a solution of cellulose acetate in acetone at 25 C is 0.404 m3/mol. The average molar mass of the polymer in this solvent will be equal to (k - 4.30*10-5 (mol/m3), α - 0.82):
a) 6.9*104 g/mol;
b) 1.8*104 g/mol;
c) 8.1 * 104 g/mol.

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