305. In water at 20 degrees, gamma globulin protein has a sedimentation constant of 7.75 * 10-13 s, a diffusion coefficient of 4.80 * 10-11 m2 / s and a specific partial volume of 0.739 cm3 / g. calculate the molar mass of gamma globulin and the radius of the molecule, assuming a spherical shape. (water density 0.998 g/cm3, viscosity 1.002 mPa*s)

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