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The Stokes-Einstein equation gives an estimate of the frictional coefficient, f, in terms of molecular parameters assuming generally spherical molecules. f = 6πηr (a) The diffusion coefficient for human hemoglobin in water at 298 K, which has a viscosity, η, of 8.91x10^-3 kg/(m·s), is 6.90x10^-11 m^2/s. Assuming hemoglobin is spherical enough for Stokes law to be applicable, find the radius of hemoglobin. (b) X-ray crystallography studies of hemoglobin itself have shown that it is approximately spherical with a radius of 2.75 nm. Is this approximately what you calculated? If not, why might there be a discrepancy?

          The Stokes-Einstein equation gives an estimate of the frictional coefficient, f, in terms of molecular parameters assuming generally spherical molecules. f = 6πηr (a) The diffusion coefficient for human hemoglobin in water at 298 K, which has a viscosity, η, of 8.91x10^-3 kg/(m·s), is 6.90x10^-11 m^2/s. Assuming hemoglobin is spherical enough for Stokes law to be applicable, find the radius of hemoglobin. (b) X-ray crystallography studies of hemoglobin itself have shown that it is approximately spherical with a radius of 2.75 nm. Is this approximately what you calculated? If not, why might there be a discrepancy?

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