89. Determine the molar mass of polyvinyl acetate in several solvents (1-chloroform, 2-benzene, 3-acetone) and give the average of the three values using the experimental data of the viscometric method:

Concentration of the solution Reduced viscosity of the solution ηsp/s Constants:
Сm, kg/m3 1.0 3.0 5.0 7.0
1 2 3
0.385 0.242 0.222
0.465 0.285 0.260
0.530 0.310 0.295
0.615 0.355 0.330
K1 \u003d 6.5 * 10-5, α \u003d 0.71
K2 = 5.7 * 10-5, α = 0.70
K3 \u003d 5.5 * 10-5, α \u003d 0.70

If you do not open the file - install the RAR archiver. Inside the archive you will find a solution in Word format.