14. Calculate the molecular weight of ethylcellulose in

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14. Calculate the molecular weight of ethylcellulose in aniline using the experimental data of the viscosimetric method:
 
Concentration of solution C, kg / m 3 1.0 1.75 2.5 3.25 4.0 4.5
Specific viscosity of the solution η ud 0.24 0.52 0.87 1.14 1.38 1.61
 
Constants: K = 6,9⋅10 -5, α = 0,72.

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