406. A polymer with a molar mass of 17 kg / mol and a specific volume of 0.773 cm3 / g is subjected to centrifugation at 20 ° C in water (integrity 0.998 g / cm3) until equilibrium. How many times the polymer concentration at a distance of 7 cm from the axis of rotation is greater than the concentration at a distance of 6 cm if the number of revolutions of the centrifuge per minute is 60,000.
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