Calculate the radius - protein with a density, Physics

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1. A protein with a density of 1.41 g/cm³ has a molecular weight of 5000 g/mol.

a. Calculate its radius.

b. The radius measured during an experiment turned out to be 2.24 X 10^-7 cm. Is this different than the one calculated in part a? If yes, explain this discrepancy.

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