919. Determine the coefficients of the Mark-Houwink equation for polyisobutylene in cyclohexane at 30 ° C according to the following data:
M * 10-3 g/mol 37.8 80.6 167 251 333 540 710
[η ], dl/g 0.388 0.638 1.12 1.50 1.81 2.48 2.87

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